Guy of Lusignan
Sybilla's maternal uncle, Joscelin III of Courtenay, persuaded Raymond of Tripoli to leave Jerusalem to hold an assembly in Tiberias for the barons of the realm. After the regent departed to Tiberias, Joscelin invited Sybilla and Guy of Lusignan to Jerusalem. As soon as Raymond realized that Joscelin had deceived him, he summoned the High Court to Nablus. All the barons of the realm (including Humphrey) hurried to Nablus, except Humphrey's stepfather, Raynald of Châtillon, who went to Jerusalem. The barons sent messengers to Jerusalem to remind Sybilla, Guy of Lusignan, and their supporters, of the High Court's decision on the matter of the succession of Baldwin V. Ignoring their messages, Heraclius, Latin Patriarch of Jerusalem, crowned Sybilla queen, and she in turn placed the crown on her husband's head. Before long, acting on Raymond of Tripoli's proposal, the barons at Nablus decided to proclaim Isabella and Humphrey queen and king against Sybilla and Guy.