JOHN III DOUKAS VATATZES, latinized as Ducas Vatatzes c. 1192, Didymoteicho – 3 November 1254, Nymphaion) was emperor of Nicaea 1221-1254.
John Doukas Vatatzes was probably the son of the general Basileios Vatatzes, Duke of Thrace, who died in 1193, and his wife, an unnamed daughter of Isaakios Angelos and cousin of the Emperors Isaac II Angelos and Alexios III Angelos. He had two older brothers. The eldest was Isaakios Doukas Vatatzes (died 1261), who married and had two children: Ioannes Vatatzes (born 1215), who married to Eudokia Angelina and had two daughters Theodora Doukaina Vatatzaina, wife of Michael VIII Palaiologos, and Maria Vatatzaina, married to Michael Doukas Glabas Tarchaneiotes, Military Goveror of Thrace; and a daughter, married to Konstantinos Strategopoulos. His other older brother was the father in law of Alexios Raul (died 1258). http://en.wikipedia.org/wiki/John_III_Doukas_Vatatzes
ncG1vNJzZmifp2O0prrEmqWerF6kv6h7wqisrKGen7Kius2edqWZnpyKprqFp3SvmaSWwbux0l%2BmnHVgW71%2Bts6apaedo2C2qrWKnaauo5Go