Editing Stephen V of Hungary (section)

===Duke of Slavonia (1245–1257)===
[[File:AlzbetaKumanska kralovna.jpg|thumb|right|alt=Seal of Elizabeth the Cuman|Seal of Stephen's wife, [[Elizabeth the Cuman]]]]
A royal charter of 1246 mentions Stephen as "King, and [[Duke of Slavonia]]".{{sfn|Kristó|Makk|1996|p=267}} Apparently, in the previous year, Béla had his son [[coronation of the Hungarian monarch|crowned]] as [[junior king]] and endowed with the lands between the river [[Dráva]] and the [[Adriatic Sea]], according to historians [[Gyula Kristó]] and [[Ferenc Makk]].{{sfn|Kristó|Makk|1996|p=267}}{{sfn|Bartl|Čičaj|Kohútova|Letz|2002|p=32}} The seven-year-old Stephen's provinces—[[Kingdom of Croatia (1102–1526)|Croatia]], [[Dalmatia]] and [[Slavonia]]—were administered by royal governors, known as [[ban (title)|bans]].{{sfn|Kristó|Makk|1996|p=267}}{{sfn|Zsoldos|2007|p=13}}

In a letter addressed to [[Pope Innocent IV]] in the late 1240s, Béla IV wrote that "[o]n behalf of [[Christendom]] we had our son marry a [[Cumans|Cuman]] girl".{{sfn|Bárány|2012|p=353}} The bride was [[Elizabeth the Cuman|Elizabeth]], the daughter of a leader of the Cumans whom Béla had invited to settle in the plains along the river [[Tisza]].{{sfn|Berend|2001|p=261}}{{sfn|Engel|2001|p=105}} Elizabeth had been baptized, but ten Cuman chieftains present at the ceremony nevertheless took their customary oath upon a dog cut into two by a sword.{{sfn|Berend|2001|pp=98, 261}}