Editing Sigismund, Holy Roman Emperor (section)

==== Return to Hungary ====
[[File:Sigismundof Luxemburg.jpg|thumb|left|upright=.6|Sigismund of Luxembourg, official imprint.]]
[[File:Luxemburgi_Zsigmond_király_(1387-1437)_első_kettős_felségpecsétjének_hátlapja_(1384-1405).jpg|alt=Béla IV of Hungary, king, royal, seal, gold, golden bull, Hungary, double cross, Hungarian coat of arm|thumb|upright=.6|Reverse of the first double seal (1387–1405) of King Sigismund of Hungary]]
On his return to Hungary in 1401, Sigismund was imprisoned once and deposed twice. That year, he aided an uprising against [[Wenceslaus IV]], during the course of which the [[Kingdom of Bohemia|Bohemia]]n king was taken prisoner, and Sigismund ruled Bohemia for nineteen months. He released Wenceslaus in 1403. In the meantime, a group of Hungarian noblemen swore loyalty to the last Anjou monarch, [[Ladislaus of Naples]], putting their hands on the relic of Saint Ladislas of Hungary in Nagyvárad (today Oradea). Ladislaus was the son of the murdered [[Charles II of Hungary]], and thus a distant relative of the long-dead King [[Louis I of Hungary]]. Ladislaus captured Zara (today [[Zadar]]) in 1403, but soon stopped any military advance. This struggle in turn led to a war with the [[Republic of Venice]], as Ladislaus had sold [[Dalmatian city-states|the Dalmatian cities]] to the Venetians for 100,000 ducats<ref name=EB1911/> before leaving for his own land. In the following years, Sigismund acted indirectly to thwart Ladislaus' attempts to conquer central Italy, by allying with the Italian cities resisting him and by applying diplomatic pressure on him.{{citation needed|date=September 2022}}

Due to his frequent absences attending to business in the other countries over which he ruled, he was obliged to consult Diets in Hungary with more frequency than his predecessors and institute the office of Palatine as chief administrator while he was away.{{Citation needed|date=June 2023}} In 1404, Sigismund introduced the ''Placetum Regium''. According to this decree, [[Papal bull]]s could not be pronounced in Hungary without the consent of the king. During his long reign, the royal [[Buda Castle]] became probably the largest Gothic palace of the [[Late Middle Ages]].{{citation needed|date=September 2022}}