Baldwin had leprosy, which did not stop him from trying to be an effective king, but it meant marriage and procreation was out of the question. The best route was his sister, Sibylla. She had already been married, to William of Montferrat, and had a son named Baldwin, but William died from malaria. Sibylla herself was in the line of succession, but they wanted to make sure it would last beyond her.
Baldwin himself had become ill when visiting William, and although he survived for several more years, it became important to make sure Sibylla had a husband who could help raise her son to be the next king, and who could be trusted to perform as regent for that son so that Baldwin could safely abdicate, since he was becoming increasingly unable to perform his duties.
The High Court wanted her to marry Duke Hugh III of Burgundy, who was now a vassal of King Philip II of France after Philip invaded Burgundy. Baldwin was so desperate to get Sibylla married that he sent a message to Philip, empowering him to choose another suitor if Hugh refused. Hugh accepted, and intended to sail to Jerusalem in early 1180 for an Easter wedding. Unfortunately, internal strife in France prevented Hugh from leaving.
William of Tyre, who had helped raise Baldwin IV and wrote a history of the lands controlled by the Crusades, recorded that Count Raymond III of Tripoli and Prince Bohemond III of Antioch set out for Jerusalem, sensing Baldwin's weakness and looking to usurp his throne. There is a belief that Raymond's intent was to force Baldwin to marry Sibylla to Baldwin of Ibelin, an important noble and close friend of Raymond, then force Baldwin to abdicate.
Their plan was foiled when Sibylla hastily married Guy of Lusignan, a French knight from Poitou, in 1180. (The illustration is of their marriage.) (His older brother, Aimery of Lusignan, had married the daughter of Baldwin of Ibelin, which would have made family gatherings awkward.) Guy became, by marriage, Count of Jaffa and Ascalon and bailiff of Jerusalem.
In 1182, with his health declining, King Baldwin declared Guy regent, but doubts about how Guy and Raynald of Châtillon provoked Saladin with whom Baldwin had a truce disillusioned Baldwin, and he tried to have the marriage annulled. Baldwin died in 1185, having become blind and lame in his final years. Sibylla's son became Baldwin V, but died within the year.
The High Court agreed that she should be queen, but only on the condition that she would annul the marriage to Guy. Sibylla agreed, on the condition that she be allowed to choose her next husband. The marriage was annulled, Sibylla was crowned Queen of Jerusalem in Summer 1186, and she chose as her husband ... Guy of Lusignan, who was crowned King of Jerusalem in September 1186.
Guy has been mentioned a few times before, and I'd like to tell you a little more about his life before and after becoming King of Jerusalem.
