John Angelos or Angelus (Greek: Ἰωάννης Ἄγγελος, Hungarian: Angelos János; c. 1193 – d. before 1250), also known as Good John (Greek: Καλοϊωάννης / Kaloiōannēs, Hungarian: Kaloján), was a Byzantine prince who migrated to Hungary, and served as governor of various southern regions, including Syrmia, from 1227 until c. 1250, during the reign of Hungarian kings Andrew II and Béla IV, who were his maternal relatives.
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Life
John Angelos was the son of Isaac II Angelos, the Byzantine Emperor from 1185 to 1195, and again from 1203 to 1204, from his second marriage with Margaret of Hungary, the daughter of King Béla III (r. 1172–1196). John had three older half-siblings from his father's first marriage: Anna-Euphrosyne, Irene Angelina and Alexios IV Angelos, while he also had a younger full brother, Manuel Angelos (b. after 1195 – d. 1212). In 1195, his father was deposed, but restored to the throne in 1203, together with Alexios IV, both of them being deposed and murdered in 1204, while empress Margaret and her sons John and Manuel survived the Sack of Constantinople. Soon after, they left for Thessalonica, where Margaret was remarried to Boniface of Montferrat, the King of Thessalonica. Boniface died in 1207, and Margaret became regent for her infant son Demetrius who succeeded his father Boniface as King of Thessalonica, keeping her older sons Manuel and John by her side.
Margaret lost regency in 1216-1217, and remarried to Nicholas I of Saint-Omer. The family later moved to the Hungarian court c. 1220, where John entered into royal service. Margaret's brother, King Andrew II of Hungary (r. 1205–1235), gave them possessions in various southern regions of the Kingdom of Hungary. Those possessions were inherited by her sons, both John and his half-brother William of Saint-Omer, who also came to Hungary. John ruled in "Syrmia and beyond", i.e. regions south of the Sava river, including Belgrade and Macsó, at least until 1242, or sometime later.
