Baldwin IV (Baldwin the Leper), c.1161–1185, Latin king of Jerusalem (1174–85), son and successor of Amalric I. Raymond, count of Tripoli, was regent from 1174 to 1176. Baldwin was constantly engaged, except for a truce (1180–82), in defending his kingdom against Saladin. In 1183 his leprosy began to spread very rapidly; he appointed Guy of Lusignan as his regent, but in the same year he withdrew the commission and had his five-year-old nephew crowned king as Baldwin V (d. 1186). Raymond was regent for Baldwin V, who was succeeded as king by Guy of Lusignan.
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