Baldwin of Ibelin year, the king betrothed his younger half-sister Isabella of Jerusalem, Balian's stepdaughter, to Humphrey IV of Toron, to further reduce the Ibelins' influence. In 1183 he supported Raymond against Guy, who was by now regent for the ailing Baldwin IV. Lord Baldwin was among the barons who advised the king to crown Sibylla's son Baldwin V in 1183, while Baldwin IV was still alive; this was an attempt to prevent Guy from succeeding as king. Baldwin V became sole king while still a child in 1185, and when the young king died in 1186, Sibylla was crowned queen with Guy
Baldwin I, Latin Emperor trying to seduce Kaloyan's wife. The historian George Acropolites reports that the Tsar had Baldwin's skull made into a drinking cup, just as had happened to Nicephorus I almost four hundred years before. Tsar Kaloyan wrote to Pope Innocent III, reporting that Baldwin had died in prison. A tower of the Tsarevets fortress of the medieval Bulgarian capital, Veliko Tarnovo, is still called Baldwin's Tower; supposedly, it was the tower where he was interned. It was not until July 1206 that the Latins in Constantinople had reliable information that Baldwin was dead. His brother Henry was crowned emperor in August.