John (Hungarian: János; 1354–1360) was a Hungarian royal prince of the Capetian House of Anjou. He was the only son of Stephen of Anjou, Duke of Croatia, Dalmatia and Slavonia, and Margaret of Bavaria. He inherited his father's duchies shortly after his birth. He was regarded the heir to his sonless uncle, Louis I of Hungary, who also secured John's right to inherit Poland from Casimir III of Poland. Both Louis I and Casimir III survived John who died prematurely.
The date and place of John's birth are unknown.[2] His father was staying in Zagreb when John was born, according to his mother's charter of grant to the Zagreb Chapter.[2] Stephen of Anjou did not visit Zagreb in 1351 and 1352.[2] John's sister, Elizabeth, was born most probably in 1353.[2] Consequently, John must have been born in late 1353 or in 1354, according to historian Éva B. Halász.[2] Stephen had already received Croatia, Dalmatia and Slavonia from Louis I.[6]
Duke
Stephen died on 9 August 1354.[7] John inherited his father's provinces under the guardianship of his mother.[6] He was regarded the heir to Louis I who also persuaded Casimir III of Poland to adopt John in 1355.[8][2] Not independently of the war with Venice, Louis I appointed a lieutenant to rule Slavonia in the spring of 1356, and a ban to administer Croatia and Dalmatia in 1357.[9] John, nevertheless, was styled duke of Slavonia, Croatia and Dalmatia in 1358.[10] He died in 1360.[10]
B. Halász, Éva (2016). "Anjou István herceg (1332–1354)". In Zsoldos, Attila (ed.). Hercegek és hercegségek a középkori Magyarországon [Dukes and Dukedoms in Medieval Hungary] (in Hungarian). Városi Levéltár és Kutatóintézet. pp. 81–93. ISBN978-963-8406-13-2.
Csukovits, Enikő (1994). "Stephen 7.". In Kristó, Gyula; Engel, Pál; Makk, Ferenc (eds.). Korai magyar történeti lexikon (9–14. század) [Encyclopedia of the Early Hungarian History (9th–14th centuries)] (in Hungarian). Akadémiai Kiadó. p. 294. ISBN963-05-6722-9.
Engel, Pál (2001). The Realm of St Stephen: A History of Medieval Hungary, 895–1526. I.B. Tauris Publishers. ISBN1-86064-061-3.