or regent. Guy of Lusignan Aimery’s younger brother, Guy of Lusignan (c.1150-1194), arrived in Jerusalem at some unknown date before Easter 1180, although Ernoul said that he arrived on the advice of Aimery. Some modern historians believe that Guy was already well established in Jerusalem by 1180, but there is no supporting contemporary evidence. Aimery's success certainly facilitated the social and political advancement of Guy. Older accounts, derived from William of Tyre and Ernoul, claim that Agnes of Courtenay was concerned that her political rivals, headed by Raymond of Tripoli, intended to exercise more control by forcing her daughter, the widowed Sibylla (sister and heir presumptive to King Baldwin IV) to marry a man of their choosing. Agnes was said to have foiled these plans by advising her son Baldwin to have Sibylla married to Guy; however Baldwin, now believed to have been less malleable than earlier historians have portrayed, was considering the international implications of his sister's marriage. The best husband for her would be a knight who could rally external help to the kingdom, and not a local nobleman. As the new King of France, Philip II, was still a minor, Baldwin's first cousin King Henry II of England seemed the best prospect for such help and he owed the Pope a penitential pilgrimage to the Holy Land on account of his responsibility for the murder of Archbishop Thomas Becket. Guy was a vassal of both King Henry and of his son Richard of Poitou (the future King Richard I) and had formerly been rebellious, so they wanted to keep him overseas. Guy and Sibylla were hastily married at Easter 1180, apparently preventing a coup by Raymond's faction to marry her to Baldwin of Ibelin, the father-in-law of Aimery. By this marriage, Guy became Count of Jaffa and Ascalon and Bailli of Jerusalem. Sibylla already had a son from her first marriage to William of Montferrat, and by Guy she had two daughters, Alice and Mary de Lusignan. An ambitious man, Guy convinced King Baldwin IV to name him as regent in early 1182. But he and Raynald of Châtillon provoked Saladin, the Sultan of Egypt and Syria, during a two-year period of truce. More important to Baldwin IV's disillusionment with him was Guy's military hesitation during the Siege of Kerak. Throughout late 1183 and 1184 Baldwin IV tried to have his sister's marriage to Guy annulled, showing