Editing Ladislaus IV of Hungary (section)

===First years of majority (1277–1278)===

[[File:Morpole.jpg|thumb|right|alt=Battle on the Marchfeld |The [[Battle on the Marchfeld]] (26 August 1278)]]

Joachim Gutkeled died while battling against the Babonići in April 1277.{{sfn|Kristó|2003|p=188}}{{sfn|Érszegi|Solymosi|1981|p=172}} A month later, an assembly of the prelates, barons, noblemen, and Cumans declared Ladislaus to be of age.{{sfn|Engel|2001|p=108}}{{sfn|Kontler|1999|p=83}} The [[estates of the realm]] also authorized the 15-year-old monarch to restore internal peace with all possible means.{{sfn|Engel|2001|p=108}} Ladislaus then invaded the Kőszegis's domains in Transdanubia, but could not defeat them.{{sfn|Érszegi|Solymosi|1981|p=173}} He met Rudolf I of Germany in [[Hainburg an der Donau]] on 11 November to confirm their alliance against Ottokar II of Bohemia.{{sfn|Érszegi|Solymosi|1981|p=173}}

After the royal army captured the rebellious [[Nicholas Geregye]]'s fortress at [[Livada, Satu Mare|Adorján]] (now Adrian in Romania), Ladislaus held a "general assembly" for seven counties along the River [[Tisza]] in early summer of 1278.{{sfn|Érszegi|Solymosi|1981|p=173}} The assembly condemned two rebellious local noblemen to death.{{sfn|Érszegi|Solymosi|1981|p=173}} In Transdanubia, [[Ivan Kőszegi]] attempted to play off Ladislaus's father's first cousin, [[Andrew III of Hungary|Andrew the Venetian]], against Ladislaus.{{sfn|Érszegi|Solymosi|1981|p=173}} Andrew demanded Slavonia for himself, but returned to [[Venice]] without success.{{sfn|Érszegi|Solymosi|1981|p=173}}

Ladislaus joined forces with Rudolf I of Germany to launch a campaign against Ottokar II.{{sfn|Engel|2001|p=108}} Ladislaus's troops played a decisive role in Rudolf's victory in the [[Battle on the Marchfeld]] on 26 August.{{sfn|Engel|2001|p=108}}{{sfn|Žemlička|2011|p=111}} Ottokar was killed in the battlefield.{{sfn|Žemlička|2011|p=111}} After the battle, King Rudolf I gave Ladislaus "his thanks, declaring that through his help all Austria and Styria had been restored to him",<ref>''Simon of Kéza: The Deeds of the Hungarians'' (ch. 2.74), p. 155.</ref> according to Ladislaus's chronicler, [[Simon of Kéza]].{{sfn|Kristó|Makk|1996|p=277}}