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He was the son of Balian, Lord of Nablus and Ibelin, and Maria Comnena, widow of Amalric I of Jerusalem. By 1198 he had become constable of Jerusalem; the fact that he was the half-brother of Isabella, Queen of Jerusalem gave him considerable influence. At the time he was a vassal of Ralph of Tiberias, who was exiled from the kingdom after being accused of attempting to assassinate king Amalric II. John attempted to mediate but Amalric would not back down.