John Angelus of Syrmia

John Angelos or Angelus (, ; c. 1193 – 1253), also known as Good John ( / Kaloiōannēs, ), was a Byzantine prince who migrated to Hungary, and served as governor of various southern regions, including Syrmia, from 1227 until 1253, during the reign of Hungarian kings Andrew II and Béla IV, who were his maternal relatives.