John Angelos of Syrmia

John Angelos, called Kaloiōannēs or Good John (c. 1193 – before 1250), was a Byzantine prince, the son of Emperor Isaac II Angelos and Margaret of Hungary. After the Latin sack of Constantinople in 1204 he fled with his mother to Thessalonica and around 1220 to the Hungarian court of his uncle King Andrew II, who made him governor of Syrmia.

In 1225 he took 200 silver marks from the Archbishop of Kalocsa for the Bosnian Crusade but never campaigned. He was dead by July 1250, when his wife Matilda is recorded as his widow.