Humphrey IV of Toron was a leading baron of Jerusalem. He and Isabella married in 1183 (the illustration shows the two being betrothed by Baldwin IV), and Humphrey gave Toron to King Baldwin IV (Isabella's half-brother) at the time. The other barons of Jerusalem were willing to give Humphrey and Isabella the opportunity to become king and queen after the death of Baldwin V because they did not want Guy on the throne, but the young married couple chose instead to pay homage to Sibylla and Guy.
Now, in the midst of an ongoing conflict with Saladin, an experienced military leader would be ideal as the new King of Jerusalem, and Humphrey did not fit the bill. There was someone who already wanted th throne, and was a tried and true military leader: Conrad of Montferrat. Isabella's step-mother, Maria Comnena—also the result of the nobles forcing someone to annul their marriage if they wanted to rule—supported the idea of Conrad marrying Isabella. Humphrey, she felt, had prevented Isabella from becoming queen once, and Maria was happy to see him out of the family.
Maria swore before a papal legate, Archbishop Ubaldo of Pisa, that Isabella's betrothal at the age of eight was against her consent and the marriage should be annulled. Patriarch Heraclius of Jerusalem deferred the matter to Archbishop Baldwin of Canterbury. Baldwin would not support the annulment, saying that Conrad and Isabella would be guilty of adultery. On the other hand, Archbishop Ubaldo supported the annulment after some concessions to Pisa were made.
Isabella made it clear that Humphrey (of whom she seemed fond) should not lose everything, and the lordship of Toron was restored to him. Isabella and Conrad were married on 24 November 1190. Conrad took her back to Tyre. Guy stayed at Acre. Guy refused to concede the kingship. What they needed was to gather more of the nobles of Europe and have the matter adjudicated by a gathering of peers.
Fortunately, more of the heads of Europe were on their way. We'll see how things went next time.



