the Siege of Acre in 1190, led to a dispute over the throne of the kingdom. Balian's stepdaughter Isabella was now rightful queen, but Guy refused to concede his title, and Isabella's husband Humphrey—who had let her cause down in 1186—remained loyal to him. If Isabella were to succeed, she needed a politically acceptable and militarily competent husband, the obvious candidate being Conrad of Montferrat, who also had some claim as Baldwin V's paternal uncle. Balian and Maria seized Isabella and talked her into agreeing to a divorce. There were precedents: the annulment of Amalric I's marriage to Agnes of Courtenay, and the unsuccessful attempts to force Sibylla to divorce Guy. Isabella's marriage was annulled by Ubaldo Lanfranchi, Archbishop of Pisa, who was Papal legate, and Philip of Dreux, Bishop of Beauvais. The Bishop of Beauvais then married her to Conrad (controversially, since his brother had been married to her half-sister and it was uncertain whether he had been divorced by his Byzantine wife). The succession dispute was prolonged by the arrival of Richard I of England and Philip II of France on the Third Crusade: Richard supported Guy, as a Poitevin vassal, while Philip supported Conrad, his late father's cousin. Balian and Maria's role in Isabella's divorce and their support for Conrad as king earned them the bitter hatred of Richard and his supporters. Ambroise, who wrote a poetic account of the crusade, called Balian "more false than a goblin" and said he "should be hunted with dogs". The anonymous author of the Itinerarium Peregrinorum et Gesta Regis Ricardi wrote that Balian was a member of a "council of consummate iniquity" around Conrad, accused him of taking Conrad's bribes, and said of Maria and Balian as a couple: Steeped in Greek filth from the cradle, she had a husband whose morals matched her own: he was cruel, she was godless; he was fickle, she was pliable; he was faithless, she was fraudulent. On 28 April 1192, only days after his kingship was confirmed by election, Conrad was assassinated in Tyre. It is said that one of the two assassins responsible had entered Balian's household in Tyre some months previously, pretending to be a servant, in order to stalk his victim; the other may have similarly infiltrated Reginald of Sidon's or Conrad's own household. Richard was widely suspected of involvement in the murder. Isabella, who was expecting her first child