Isabella I of Jerusalem tried to play Isabella and her husband off against him, but Humphrey did homage to the royal couple. Isabella was the daughter of Amalric, King of Jerusalem, by his second wife, Maria Comnena. Maria Comnena (who was a grandniece of the Byzantine Emperor, Manuel I Komnenos) married Amalric on 29 August 1171. Isabella was born before September 1172. Amalric died unexpectedly on 11 July 1174. His son by his first marriage, Baldwin IV, was crowned king two weeks later. Before long, it became obvious that Baldwin suffered from lepromatous leprosy. To secure the succession of the ailing king, his sister,
Baldwin I, Latin Emperor who interpreted and observed his crusading vows strictly, and the most popular leader in the host. With Venetian support he was elected on 9 May 1204, and crowned on 16 May in the Hagia Sophia at a ceremony which closely followed Byzantine practices. During his coronation, Baldwin wore a very rich jewel that had been bought by Byzantine Emperor Manuel I Komnenos for 62,000 silver marks. Baldwin's wife Marie, unaware of these events, had sailed to Acre. There she learned of her husband's election as emperor, but died in August 1204 before she could join him. The Latin Empire was