Baldwin IV of Jerusalem Baldwin IV of Jerusalem Baldwin IV (; ; 1161 – 16 March 1185), called "the Leper", or The Leper King, reigned as King of Jerusalem from 1174 until his death. He was the son of Amalric I of Jerusalem and his first wife, Agnes of Courtenay. Baldwin spent his childhood in his father's court in Jerusalem, having little contact with his mother, Agnes of Courtenay, Countess of Jaffa and Ascalon, and later Lady of Sidon, whom his father had been forced to divorce. Baldwin IV was educated by the historian William of Tyre (later Archbishop of Tyre and Chancellor of
Baldwin of Ibelin as her consort. The Ibelins and Raymond favoured the accession of Isabella, but Humphrey refused to be crowned and cause a civil war, and instead swore allegiance to Sibylla and Guy. All the other barons of the kingdom paid homage to Guy as well, except for Raymond and Baldwin. Baldwin placed his young son Thomas under the care of his brother Balian, and exiled himself to the Principality of Antioch, where he was welcomed with great fanfare. Baldwin considered Guy "a madman and a fool", and refused to pay homage because his father had not paid homage to Guy's father