<P> In the summer of 1180, Baldwin IV married Sibylla to Guy of Lusignan, brother of the constable Amalric of Lusignan . Earlier historians claimed that Sibylla's second marriage was entirely due to the influence of the King's mother; however, Hamilton argues that this is to reflect uncritically the personal grievances of William of Tyre and of the Ibelins . A plan to marry Sibylla to Hugh III of Burgundy had broken down; Raymond of Tripoli seems to have been attempting to marry her to Baldwin of Ibelin to bolster his power - base . A foreign match was essential to the kingdom, bringing the possibility of external aid . With the new French king Philip II a minor, Guy's status as a vassal of the King's cousin Henry II of England--who owed the Pope a penitential pilgrimage--was useful in this respect . Baldwin also betrothed his 8 - year - old half - sister Isabella to Humphrey IV of Toron, repaying a debt of honour to Humphrey's grandfather, who had given his life for him at Banias, and removing Isabella from the control of her mother and the Ibelin faction (her betrothed was Raynald of Châtillon's stepson). </P> <P> Guy had previously allied himself with Raynald, who was by now taking advantage of his position at Kerak to harass the trading caravans travelling between Egypt and Damascus . After Saladin retaliated for these attacks in the campaign and Battle of Belvoir Castle in 1182, Baldwin, now blind and unable to walk, appointed Guy regent of the kingdom . By June 1183 however, Saladin had captured Aleppo and completed his encirclement of Jerusalem . </P> <P> Nevertheless, Baldwin had become offended by Guy's actions as regent . Guy attended the wedding festivities for Isabella (now about 11) and Humphrey, held in Karak; however, the festivities were interrupted by Saladin, who besieged the fortress with the wedding guests inside . Baldwin marshalled what strength he had and lifted the siege, but Guy refused to fight Saladin and Saladin's troops managed to escape . Baldwin could not tolerate this and deposed Guy as regent . In disgrace, Guy retired to Ascalon, taking his wife the princess Sibylla with him . Although Baldwin was almost beyond his prime, due to his victories in Belvoir castle, Beirut and at Kerak castle, Saladin's campaigns in the Holy Land were delayed until the remainder of Baldwin's reign . </P> <P> Although Baldwin seems to have held no ill - will towards his sister, Baldwin appointed his 5 - year - old nephew Baldwin of Montferrat as his heir and successor, with the support of Agnes and her husband Reginald of Sidon, Raymond, and many of the other barons, excluding Sibylla from the succession . Raymond was to act as guardian of the infant heir, and later as regent if Baldwin IV was to expire, but Baldwin IV himself would continue to rule . The child was crowned co-king as Baldwin V on November 20, 1183 . </P>

Who was the king of jerusalem during the crusades