Феодор Комнин Дука
After 1204, when Constantinople fell to the Fourth Crusade, he supported the ruler of Epirus Theodore Komnenos Doukas, to whom his sister Maria was married. He died probably sometime between 1224 and 1230. Some authors (Donald Nicol and Demetrios Polemis) have equated him with another John Petraliphas, who was a "megas chartoularios" in the employ of the Empire of Nicaea circa 1237, but this identification is most likely false.