Editing Charles I of Hungary (section)

==Reign==

=== Wars against the oligarchs (1308–1323) ===
{{Further|Battle of Rozgony}}
[[File:Charles I (Chronica Hungarorum).jpg|thumb|King Charles Robert as depicted in the ''[[Chronica Hungarorum]]'']]
[[File:Rozgony Battle.jpg|thumb|upright |alt=Two armies of knights on horses are fighting against each other under a fortress built on a hill |The [[Battle of Rozgony]] depicted in the ''[[Illuminated Chronicle]]'': in this battle, Charles defeated the sons of [[Amadeus Aba]] on 15&nbsp;June 1312]]
[[File:Coronation of Charles I by Virgin Mary.jpg|thumb|Coronation of Charles I. of Hungary. It was painted in 1317 by Henry Spišský cathedral provost]] 
The papal legate convoked the synod of the Hungarian prelates, who declared the monarch inviolable in December 1308.{{sfn|Solymosi|Körmendi|1981|p=191}}{{sfn|Kristó|2002|p=29}} They also urged Ladislaus Kán to hand over the Holy Crown to Charles.{{sfn|Kristó|2002|p=29}} After Kán refused to do so, the legate consecrated a new crown for Charles.{{sfn|Solymosi|Körmendi|1981|p=191}} [[Thomas II, Archbishop of Esztergom]] crowned Charles king with the new crown in the [[Matthias Church|Church of Our Lady]] in [[Buda]] on 15 or 16&nbsp;June 1309.{{sfn|Solymosi|Körmendi|1981|p=191}}{{sfn|Bartl|Čičaj|Kohútova|Letz|2002|p=37}} However, most Hungarians regarded his second coronation invalid.{{sfn|Engel|2001|p=130}} The papal legate excommunicated Ladislaus Kán, who finally agreed to give the Holy Crown to Charles.{{sfn|Solymosi|Körmendi|1981|p=191}} On 27&nbsp;August 1310, Archbishop Thomas of Esztergom put the Holy Crown on Charles's head in Székesfehérvár; thus, Charles's third coronation was performed in full accordance with customary law.{{sfn|Engel|2001|p=130}}{{sfn|Solymosi|Körmendi|1981|p=192}}{{sfn|Bartl|Čičaj|Kohútova|Letz|2002|p=37}} However, his rule remained nominal in most parts of his kingdom.{{sfn|Engel|2001|p=130}}

Matthew Csák laid siege Buda in June 1311, and Ladislaus Kán declined to assist the king.{{sfn|Pop|2005|p=252}}{{sfn|Solymosi|Körmendi|1981|p=192}} Charles sent an army to invade Matthew Csák's domains in September, but it achieved nothing.{{sfn|Kristó|2002|p=32}} In the same year, Ugrin Csák died, enabling Charles to take possession of the deceased lord's domains, which were situated between [[Požega County|Požega]] in Slavonia and [[Temesvár]] (present-day Timișoara in Romania).{{sfn|Engel|2001|p=131}}{{sfn|Zsoldos|2013|p=222}} The burghers of [[Košice|Kassa]] (now Košice in Slovakia) assassinated Amadeus Aba in September 1311.{{sfn|Zsoldos|2013|p=221}} Charles's envoys arbitrated an agreement between Aba's sons and the town, which also prescribed that the Abas withdraw from two counties and allow the noblemen inhabiting their domains to freely join Charles.{{sfn|Zsoldos|2013|p=221}} However, the Abas soon entered into an alliance with Matthew Csák against the king.{{sfn|Engel|2001|p=131}} The united forces of the Abas and Matthew Csák besieged Kassa, but Charles routed them in the [[Battle of Rozgony]] (now Rozhanovce in Slovakia) on 15&nbsp;June 1312.{{sfn|Zsoldos|2013|p=229}}{{sfn|Bartl|Čičaj|Kohútova|Letz|2002|p=37}} Almost half of the noblemen who had served Amadeus Aba fought on Charles's side in the battle.{{sfn|Zsoldos|2013|p=236}} In July, Charles captured the Abas' many fortresses in [[Abaúj]], [[Torna County|Torna]] and [[Sáros county|Sáros]] counties, including [[Füzér]], [[Regéc]], and [[Munkács]] (now Mukacheve in Ukraine).{{sfn|Solymosi|Körmendi|1981|p=193}} Thereafter he waged war against Matthew Csák, capturing [[Nagyszombat]] (now Trnava in Slovakia) in 1313 and Visegrád in 1315, but was unable to win a decisive victory.{{sfn|Engel|2001|p=131}}

Charles transferred his residence from Buda to Temesvár in early 1315.{{sfn|Kristó|2002|p=35}}{{sfn|Engel|2001|p=131}} Ladislaus Kán died in 1315, but his sons did not yield to Charles.{{sfn|Kontler|1999|p=88}}{{sfn|Pop|2005|p=252}} Charles launched a campaign against the Kőszegis in Transdanubia and Slavonia in the first half of 1316.{{sfn|Engel|2001|p=132}}{{sfn|Solymosi|Körmendi|1981|p=194}} Local noblemen joined the royal troops, which contributed to the quick collapse of the Kőszegis' rule in southern parts of their domains.{{sfn|Engel|2001|p=132}} Meanwhile, [[James Borsa]] made an alliance against Charles with Ladislaus Kán's sons and other lords, including [[Mojs II Ákos|Mojs Ákos]] and [[Peter, son of Petenye]].{{sfn|Pop|2005|p=252}} They offered the crown to [[Andrew of Galicia]].{{sfn|Pop|2005|p=252}}{{sfn|Engel|2001|p=132}} Charles's troops, which were under the command of a former supporter of the Borsas, [[Dózsa Debreceni]], defeated the rebels' united troops at [[Debrecen]] at the end of June.{{sfn|Solymosi|Körmendi|1981|p=194}}{{sfn|Zsoldos|2013|p=235}} In the next two months, many fortresses of Borsa and his allies fell to the royal troops in [[Bihar County|Bihar]], [[Szolnok County|Szolnok]], [[Borsod County|Borsod]] and [[Kolozs County|Kolozs]] counties.{{sfn|Solymosi|Körmendi|1981|p=194}} No primary source has made reference to Charles's bravery or heroic acts, suggesting that he rarely fought in person in the battles and sieges.{{sfn|Kristó|2002|p=35}} However, he had excellent strategic skills: it was always Charles who appointed the fortresses to be besieged.{{sfn|Kristó|2002|p=35}}

[[Stefan Dragutin of Serbia|Stefan Dragutin]], who controlled the [[Szerémség]], [[Macsó]] and other regions along the southern borders of Hungary, died in 1316.{{sfn|Solymosi|Körmendi|1981|p=194}}{{sfn|Fine|1994|p=260}} Charles confirmed the right of Stefan Dragutin's son, [[Vladislav, King of Syrmia|Vladislav]], to succeed his father and declared Vladislav the lawful ruler of [[Serbia]] against [[Stefan Uroš II Milutin of Serbia|Stefan Uroš II Milutin]].{{sfn|Solymosi|Körmendi|1981|p=194}} However, Stefan Uroš II captured Vladislav and invaded the Szerémség.{{sfn|Fine|1994|p=261}}{{sfn|Engel|2001|p=132}} Charles launched a counter-campaign across the river [[Száva]] and seized the fortress of Macsó.{{sfn|Engel|2001|p=132}} In May 1317, Charles's army suppressed the Abas' revolt, seizing [[Ungvár]] and [[Nevicke Castle]] (present-day Uzhhorod and Nevytsky Castle in Ukraine) from them.{{sfn|Solymosi|Körmendi|1981|p=195}} After that, Charles invaded Matthew Csák's domains and captured [[Komárno|Komárom]] (now Komárno in Slovakia) on 3&nbsp;November 1317.{{sfn|Solymosi|Körmendi|1981|p=195}} After his uncle, King Robert of Naples, granted the [[Principality of Salerno]] and the domain of [[Monte Sant'Angelo]] to his brother (Charles's younger uncle), [[John, Duke of Durazzo|John]], Charles protested and laid claim to those domains, previously held by his father.{{sfn|Kristó|2002|p=41}}{{sfn|Dümmerth|1982|p=353}}

After Charles neglected to reclaim Church property that Matthew Csák had seized by force, the prelates of the realm made an alliance in early 1318 against all who would jeopardize their interests.{{sfn|Engel|2001|p=142}} Upon their demand, Charles held a Diet in summer, but refused to confirm the [[Golden Bull of 1222]].{{sfn|Engel|2001|p=141}}{{sfn|Solymosi|Körmendi|1981|p=194}} Before the end of the year, the prelates made a complaint against Charles because he had taken possession of Church property.{{sfn|Solymosi|Körmendi|1981|p=194}} In 1319, Charles fell so seriously ill that the pope authorized Charles's confessor to absolve him from his all sins before he died, but Charles recovered.{{sfn|Kristó|2002|p=36}} In the same year, Dózsa Debreceni, whom Charles had made [[voivode of Transylvania]], launched successful expeditions against Ladislaus Kán's sons and their allies, and Charles's future [[Judge royal]], [[Alexander Köcski]], seized the Kőszegis' six fortresses.{{sfn|Solymosi|Körmendi|1981|p=196}} In summer, Charles launched an expedition against Stefan Uroš II Milutin, during which he retook Belgrade and restored the Banate of Macsó.{{sfn|Fine|1994|p=261}} The last Diet during Charles's reign was held in 1320; following that, he failed to convoke the yearly public judicial sessions, contravening the provisions of the Golden Bull.{{sfn|Engel|2001|p=140}}

Matthew Csák died on 18&nbsp;March 1321.{{sfn|Bartl|Čičaj|Kohútova|Letz|2002|p=38}} The royal army invaded the deceased lord's province, which soon disintegrated because most of his former castellans yielded without resistance.{{sfn|Solymosi|Körmendi|1981|p=197}}{{sfn|Engel|2001|p=133}} Charles personally led the siege of Csák's former seat, [[Trencsén]] (now Trenčín in Slovakia), which fell on 8&nbsp;August.{{sfn|Solymosi|Körmendi|1981|p=197}}{{sfn|Engel|2001|p=133}} About three months later, Charles's new voivode of Transylvania, [[Thomas Szécsényi]], seized [[Ciceu-Mihăiești|Csicsó]] (present-day Ciceu-Corabia in Romania), the last fortress of Ladislaus Kán's sons.{{sfn|Solymosi|Körmendi|1981|p=197}}{{sfn|Pop|2005|p=252}}

In January 1322, two Dalmatian towns, [[Šibenik]] and [[Trogir]], rebelled against [[Mladen II Šubić of Bribir|Mladen II Šubić]], who was a son of Charles's one-time leading partisan, Paul Šubić.{{sfn|Fine|1994|pp=210–211}} The two towns also accepted the suzerainty of the [[Republic of Venice]] although Charles had urged Venice not to intervene in the conflict between his subjects.{{sfn|Solymosi|Körmendi|1981|p=197}} Many Croatian lords (including his own brother, [[Paul II Šubić of Bribir|Paul II Šubić]]) also turned against Mladen, and their coalition defeated him at [[Klis]].{{sfn|Fine|1994|p=212}} In September, Charles marched to Croatia where all the Croatian lords who were opposed to Mladen Šubić yielded to him in [[Knin]].{{sfn|Fine|1994|p=212}} Mladen Šubić also visited Charles, but the king had the powerful lord imprisoned.{{sfn|Fine|1994|p=212}}

=== Consolidation and reforms (1323–1330) ===

[[File:Coa Hungary Country History Charles I (1310-1342).svg|thumb|150px|Coats of Arms of Charles I of Anjou, King of Hungary]]

As one of his charters concluded, Charles had taken "full possession" of his kingdom by 1323.{{sfn|Engel|2001|pp=144,391}} In the first half of the year, he moved his capital from Temesvár to Visegrád in the centre of his kingdom.{{sfn|Engel|2001|p=132}}{{sfn|Solymosi|Körmendi|1981|p=198}} In the same year, the [[Duke of Austria|Dukes of Austria]] renounced [[Pressburg]] (now Bratislava in Slovakia), which they had controlled for decades, in exchange for the support they had received from Charles against [[Louis IV, Holy Roman Emperor]], in 1322.{{sfn|Engel|2001|p=136}}

Royal power was only nominally restored in the lands between the [[Carpathian Mountains]] and the [[Lower Danube]], which had been united under a [[voivode]], known as [[Basarab I of Wallachia|Basarab]], by the early 1320s.{{sfn|Sălăgean|2005|p=149}} Although Basarab was willing to accept Charles's suzerainty in a peace treaty signed in 1324, he refrained from renouncing control of the lands he had occupied in the [[Banate of Severin]].{{sfn|Sălăgean|2005|p=149}} Charles also attempted to reinstate royal authority in Croatia and Slavonia.{{sfn|Fine|1994|p=213}} He dismissed the [[Ban of Slavonia]], [[John Babonić]], replacing him with [[Mikcs Ákos]] in 1325.{{sfn|Fine|1994|p=213}}{{sfn|Engel|2001|p=145}} Ban Mikcs invaded Croatia to subjugate the local lords who had seized the former castles of Mladen Subić without the king's approval, but one of the Croatian lords, [[Ivan I Nelipac]], routed the ban's troops in 1326.{{sfn|Fine|1994|p=213}} Consequently, royal power remained only nominal in Croatia during Charles's reign.{{sfn|Fine|1994|p=213}}{{sfn|Engel|2001|p=135}} The [[House of Babonić|Babonići]] and the Kőszegis rose up in open rebellion in 1327, but Ban Mikcs and Alexander Köcski defeated them.{{sfn|Engel|2001|p=135}} In retaliation, at least eight fortresses of the rebellious lords were confiscated in Slavonia and Transdanubia.{{sfn|Solymosi|Körmendi|1981|p=199}}

Through his victory over the oligarchs, Charles acquired about 60% of the Hungarian castles, along with the estates belonging to them.{{sfn|Engel|2001|pp=149–150}} In 1323, he set about revising his previous land grants, which enabled him to reclaim former royal estates.{{sfn|Engel|2001|p=150}} During his reign, special commissions were set up to detect royal estates that had been unlawfully acquired by their owners.{{sfn|Engel|2001|p=149}} Charles refrained from making perpetual grants to his partisans.{{sfn|Engel|2001|p=150}} Instead, he applied a system of "office fiefs" (or ''[[Honour (feudal barony)|honors]]''), whereby his officials were entitled to enjoy all revenues accrued from their offices, but only for the time they held those offices.{{sfn|Kontler|1999|p=89}}{{sfn|Cartledge|2011|p=34}} That system assured the preponderance of royal power, enabling Charles to rule "with the plenitude of power", as he emphasized in one of his charters of 1335.{{sfn|Kontler|1999|p=89}}{{sfn|Engel|2001|p=140}} He even ignored customary law: for instance, "[[Prefection|promoting a daughter to a son]]", which entitled her to inherit her father's estates instead of her male cousins.{{sfn|Engel|2001|pp=140, 178}} Charles also took control of the administration of the Church in Hungary.{{sfn|Engel|2001|p=143}} He appointed the Hungarian prelates at will, without allowing the [[cathedral chapter]]s to elect them.{{sfn|Engel|2001|p=143}}

[[File:FlorenKarlaRobertazAnjou.jpg|thumb |left|alt=A golden coin depicting a lily  |A gold forint of Charles, based on the Italian [[Florin (Italian coin)|florin]] made popular by the [[Republic of Florence]] in the 13th century]]
He promoted the spread of [[chivalrous]] culture in his realms.{{sfn|Boulton|2000|p=29}} He regularly held [[Tournament (medieval)|tournaments]] and introduced the new ranks of "page of the royal court" and "knight of the royal court".{{sfn|Boulton|2000|p=29}}{{sfn|Engel|2001|pp=146–147}} Charles was the first monarch to create a secular [[order of knighthood]] by establishing the [[Order of Saint George (Kingdom of Hungary)|Order of Saint George]] in 1326.{{sfn|Boulton|2000|p=27}}{{sfn|Cartledge|2011|p=35}} He was the first Hungarian king to grant helmet [[Crest (heraldry)|crests]] to his faithful followers to distinguish them from others "by means of an ''insignium'' of their own", as he emphasized in one of his charters.{{sfn|Boulton|2000|p=29}}{{sfn|Engel|2001|p=147}}

Charles reorganized and improved the administration of royal revenues.{{sfn|Kontler|1999|p=90}} During his reign, five new "chambers" (administrative bodies headed by German, Italian or Hungarian merchants) were established for the control and collection of royal revenues from coinage, monopolies and custom duties.{{sfn|Engel|2001|p=154}} In 1327, he partially abolished the royal monopoly of gold mining, giving one third of the royal revenues from the gold extracted from a newly opened mine to the owner of the land where that mine was discovered.{{sfn|Engel|2001|p=156}} In the next few years, new gold mines were opened at [[Körmöcbánya]] (now Kremnica in Slovakia), [[Nagybánya]] (present-day Baia Mare in Romania) and [[Aranyosbánya]] (now Baia de Arieș in Romania).{{sfn|Kontler|1999|p=90}}{{sfn|Engel|2001|p=155}} Hungarian mines yielded about {{convert|1400|kg|lb}} of gold around 1330, which made up more than 30% of the world's total production.{{sfn|Cartledge|2011|p=34}} The [[Mint (coin)|minting of gold coins]] began under Charles's auspices in the lands north of the Alps in Europe.{{sfn|Engel|2001|p=156}} His [[florin]]s, which were modelled on the gold coins of Florence, were first issued in 1326.{{sfn|Engel|2001|p=156}}{{sfn|Kontler|1999|p=91}}

[[File:Zach Felician merenylete.jpg|thumb |right |alt=An elderly bearded man holding a sword is stabbed in the neck by a young man |The attempt of [[Felician Záh]] on the royal family, depicted in the ''[[Illuminated Chronicle]]'']]
Internal peace and increasing royal revenues strengthened the international position of Hungary in the 1320s.{{sfn|Kontler|1999|p=92}}{{sfn|Engel|2001|p=134}} On 13&nbsp;February 1327, Charles and [[John of Bohemia]] signed an alliance in [[Nagyszombat]] (present-day Trnava in Slovakia) against the [[Habsburgs]], who had occupied Pressburg.{{sfn|Bartl|Čičaj|Kohútova|Letz|2002|p=38}} In the summer of 1328 Hungarian and Bohemian troops invaded Austria and routed the Austrian army on the banks of the [[Leitha River]].{{sfn|Solymosi|Körmendi|1981|p=200}} On 21 September 1328, Charles signed a peace treaty with the three dukes of Austria ([[Frederick the Fair]], [[Albert II, Duke of Austria|Albert the Lame]], and [[Otto the Merry]]), who renounced Pressburg and the [[Muraköz]] (now Međimurje in Croatia).{{sfn|Engel|2001|p=136}}{{sfn|Solymosi|Körmendi|1981|p=201}} The following year, Serbian troops laid siege to Belgrade, but Charles relieved the fortress.{{sfn|Engel|2001|p=135}}

Alliance with his father-in-law, [[Władysław I the Elbow-high]], [[King of Poland]], became a permanent element of Charles's foreign policy in the 1320s.{{sfn|Engel|2001|p=136}} After being defeated by the united forces of the [[Teutonic Knights]] and John of Bohemia, Władysław&nbsp;I sent his son and heir, [[Casimir III the Great|Casimir]], to Visegrád in late 1329 to seek assistance from Charles.{{sfn|Knoll|1972|pp=51, 54}} During his stay in Charles's court, the nineteen-year-old Casimir seduced [[Clara Záh]], who was a [[lady-in-waiting]] of Charles's wife, [[Elisabeth of Poland]], according to an Italian writer.{{sfn|Knoll|1972|p=54}}{{sfn|Dümmerth|1982|p=341}}{{sfn|Engel|2001|p=139}} On 17&nbsp;April 1330, the young lady's father, [[Felician Záh]], stormed into the dining room of the royal palace at Visegrád with a sword in his hand and attacked the royal family.{{sfn|Engel|2001|p=138}} Záh wounded both Charles and the queen on their right hand and attempted to kill their two sons, [[Louis I of Hungary|Louis]] and [[Andrew, Duke of Calabria|Andrew]], before the royal guards killed him.{{sfn|Kristó|2002|p=40}} Charles's revenge was brutal: with the exception of Clara, Felician Záh's children were tortured to death; Clara's lips and all eight fingers were cut before she was dragged by a horse through the streets of many towns; all of Felician's other relatives within the third degree of kinship (including his sons-in-law and sisters) were executed, and those within the seventh degree were condemned to perpetual serfdom.{{sfn|Kristó|2002|pp=40–41}}{{sfn|Engel|2001|p=139}}

=== Active foreign policy (1330–1339) ===

[[File:Chronicon Pictum - Battle of Posada.png|thumb|right|[[Battle of Posada]]: [[Wallachia]]n (Romanian) warriors ambushed and defeated the Hungarian mounted knights in a narrow valley.]]

In September 1330, Charles launched a military expedition against [[Basarab I of Wallachia]] who had attempted to get rid of his suzerainty.{{sfn|Sălăgean|2005|p=194}}{{sfn|Engel|2001|p=135}} After seizing the fortress of [[Drobeta-Turnu Severin|Severin]] (present-day Drobeta-Turnu Severin in Romania), he refused to make peace with Basarab and marched towards [[Curtea de Argeș]], which was Basarab's seat.{{sfn|Sălăgean|2005|p=194}} The Wallachians applied [[scorched earth]] tactics, compelling Charles to make a truce with Basarab and withdraw his troops from Wallachia.{{sfn|Sălăgean|2005|p=194}} While the royal troops were marching through a narrow pass across the Southern Carpathians on 9&nbsp;November, the Wallachians [[Battle of Posada|ambushed them]].{{sfn|Sălăgean|2005|p=195}} During the next four days, the royal army was decimated; Charles could only escape from the battlefield after changing his clothes with one of his knights, [[Desiderius Hédervári]], who sacrificed his life to enable the king's escape.{{sfn|Sălăgean|2005|p=195}}{{sfn|Engel|2001|p=136}} Charles did not attempt a new invasion of Wallachia, which subsequently developed into an independent principality.{{sfn|Sălăgean|2005|p=195}}{{sfn|Engel|2001|p=136}}

In September 1331, Charles made an alliance with Otto the Merry, Duke of Austria, against Bohemia.{{sfn|Solymosi|Körmendi|1981|p=202}} He also sent reinforcements to Poland to fight against the Teutonic Knights and the Bohemians.{{sfn|Knoll|1972|p=58}} In 1332 he signed a peace treaty with John of Bohemia and mediated a truce between Bohemia and Poland.{{sfn|Solymosi|Körmendi|1981|p=202}}{{sfn|Knoll|1972|p=61}} In 1332 Charles allowed the collection of the papal tithe (the tenth part of the Church revenues) in his realms only after the Holy See agreed to give one third of the money collected to him.{{sfn|Engel|2001|p=143}} After years of negotiations, Charles visited his uncle, Robert, in Naples in July 1333.{{sfn|Solymosi|Körmendi|1981|pp=202–203}}{{sfn|Dümmerth|1982|p=352}} Two months later, Charles's son, Andrew, was betrothed to Robert's granddaughter, [[Joanna I of Naples|Joanna]], who had been made her grandfather's heir.{{sfn|Dümmerth|1982|p=352}}{{sfn|Engel|2001|pp=137–138}} Charles returned to Hungary in early 1334.{{sfn|Solymosi|Körmendi|1981|p=203}} In retaliation for a previous Serbian raid, he invaded Serbia and captured the fortress of [[Galambóc]] (now Golubac in Serbia).{{sfn|Engel|2001|p=135}}

In summer 1335, the delegates of John of Bohemia and the new King of Poland, [[Casimir III of Poland|Casimir III]], entered into negotiations in Trencsén to put an end to the conflicts between the two countries.{{sfn|Knoll|1972|p=73}} With Charles's mediation, a [[Treaty of Trentschin|compromise was reached]] on 24&nbsp;August: John of Bohemia renounced his claim to Poland and Casimir of Poland acknowledged John of Bohemia's suzerainty in [[Silesia]].{{sfn|Knoll|1972|p=73}}{{sfn|Engel|2001|p=137}} On 3&nbsp;September, Charles signed an alliance with John of Bohemia in Visegrád, which was primarily formed against the Dukes of Austria.{{sfn|Knoll|1972|pp=74–75}} Upon Charles's invitation, John of Bohemia and Casimir of Poland met in Visegrád in November.{{sfn|Engel|2001|p=137}} During the [[Congress of Visegrád (1335)|Congress of Visegrád]], the two rulers confirmed the compromise that their delegates had worked out in Trencsén.{{sfn|Knoll|1972|p=75}} Casimir&nbsp;III also promised to pay 400,000 [[groschen]] to John of Bohemia, but a part of this indemnification (120,000 groschen) was finally paid off by Charles instead of his brother-in-law.{{sfn|Knoll|1972|p=75}} The three rulers agreed upon a mutual defence union against the Habsburgs, and a new commercial route was set up to enable merchants travelling between Hungary and the [[Holy Roman Empire]] to bypass [[Vienna]].{{sfn|Engel|2001|p=137}}

[[File:Molnár József Carol Robert fleeing from Posada Battle.jpg|thumb|left|Romantic painting Charles' army wear hussar clothes of the 17th century, by [[József Molnár (painter)|József Molnár]]]]
The Babonići and the Kőszegis made an alliance with the Dukes of Austria in January 1336.{{sfn|Engel|2001|p=134}}{{sfn|Solymosi|Körmendi|1981|p=204}} John of Bohemia, who claimed [[Duchy of Carinthia|Carinthia]] from the Habsburgs, invaded Austria in February.{{sfn|Solymosi|Körmendi|1981|p=204}}{{sfn|Knoll|1972|p=86}} Casimir&nbsp;III of Poland came to Austria to assist him in late June.{{sfn|Knoll|1972|p=86}} Charles soon joined them at [[Marchegg]].{{sfn|Knoll|1972|p=86}} The dukes sought reconciliation and signed a peace treaty with John of Bohemia in July.{{sfn|Solymosi|Körmendi|1981|p=204}} Charles signed a truce with them on 13&nbsp;December, and launched a new expedition against Austria early the next year.{{sfn|Solymosi|Körmendi|1981|pp=204–205}} He forced the Babonići and the Kőszegis to yield, and the latter were also compelled to hand over to him their fortresses along the frontier in exchange for faraway castles.{{sfn|Engel|2001|p=134}}{{sfn|Solymosi|Körmendi|1981|p=205}} Charles's peace treaty with Albert and Otto of Austria, which was signed on 11&nbsp;September 1337, forbade both the dukes and Charles to give shelter to the other party's rebellious subjects.{{sfn|Solymosi|Körmendi|1981|p=205}}

Charles continued the reform of coinage in the late 1330s.{{sfn|Engel|2001|p=155}} In 1336, he abolished the compulsory exchange of old coins for newly issued coins for villagers, but introduced a new tax, the [[chamber's profit]], to compensate the loss of royal revenues.{{sfn|Kontler|1999|pp=91–92}}{{sfn|Engel|2001|p=155}} Two years later, Charles ordered the minting of a new silver penny and prohibited payments made in foreign coins or [[silver bar]]s.{{sfn|Engel|2001|p=155}}

John of Bohemia's heir, [[Charles IV, Holy Roman Emperor|Charles]], [[Margrave of Moravia]], visited Charles in Visegrád in early 1338.{{sfn|Knoll|1972|p=95}} The margrave acknowledged the right of Charles's son, Louis, to inherit Poland if Casimir&nbsp;III died without a son in exchange for Charles's promise to persuade Casimir&nbsp;III not to invade Silesia.{{sfn|Knoll|1972|pp=95–96}} Two leading Polish lords, Zbigniew, chancellor of Cracow, and [[Spycimir Leliwita]], also supported this plan and persuaded Casimir&nbsp;III, who lost his first wife on 26&nbsp;May 1339, to start negotiations with Charles.{{sfn|Knoll|1972|pp=95–96}} In July, Casimir came to Hungary and designated his sister (Charles's wife), Elizabeth, and her sons as his heirs.{{sfn|Knoll|1972|p=96}}{{sfn|Solymosi|Körmendi|1981|p=206}} On his sons' behalf, Charles promised that they would make every effort to reconquer all lands that Poland had lost and that they would refrain from employing foreigners in Poland.{{sfn|Knoll|1972|p=96}}{{sfn|Solymosi|Körmendi|1981|p=206}}
[[File:Bačka tvrđava - panoramio (10).jpg|thumb|right|200px|[[Bač Fortress]], founded by Charles I]]

=== Last years (1339–1342) ===

Charles obliged the Kőszegis to renounce their last fortresses along the western borders of the kingdom in 1339 or 1340.{{sfn|Engel|2001|p=150}} He divided the large [[Zólyom County]] (now in Slovakia), which had been dominated by a powerful local lord, Donch, into three smaller counties in 1340.{{sfn|Engel|2001|p=145}} The following year, Charles also forced Donch to renounce his two fortresses in Zólyom in exchange for one castle in the distant [[Kraszna County]] (in present-day Romania).{{sfn|Engel|2001|pp=145, 150}} Around the same time, [[Stephen Uroš IV Dušan of Serbia]], invaded [[Sirmium]] and captured Belgrade.{{sfn|Engel|2001|p=135}}{{sfn|Cartledge|2011|p=36}}

Charles was ailing during the last years of his life.{{sfn|Csukovits|2012a|p=115}} He died in Visegrád on 16&nbsp;July 1342.{{sfn|Kristó|2002|p=43}} His corpse was first delivered to Buda where a [[Mass (Roman Rite)|Mass]] was said for his soul.{{sfn|Kristó|2002|p=43}} From Buda, his corpse was taken to [[Székesfehérvár]].{{sfn|Kristó|2002|p=43}} He was buried in the [[Székesfehérvár Basilica]] a month after his death.{{sfn|Engel|2001|p=138}} His brother-in-law, Casimir&nbsp;III of Poland, and Charles, Margrave of Moravia, were present at his funeral, an indication of Charles's international prestige.{{sfn|Engel|2001|p=138}}