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In May 1182, Saladin invaded the Kingdom of Jerusalem by way of Eilat, the Transjordan and Galilee. During the summer, he was successfully resisted by King Baldwin IV of Jerusalem in the campaign and Battle of Belvoir Castle; however, the Crusader lands were badly damaged by Saracen raiders. By September 1183, Baldwin, crippled by leprosy, could no longer function as monarch. Guy of Lusignan, who had married Baldwin's sister Sibylla of Jerusalem in 1180, was appointed regent.