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 of Jerusalem his homeland. The crusaders stopped at the frontier of Hungary in September. Godfrey left Baldwin in charge of his troops during his conference with Coloman, King of Hungary, regarding the conditions of the crusaders' march across the country. He agreed to hand over Baldwin, along with Baldwin's wife and retainers, as hostages to ensure their troops' good conduct. Baldwin and Godehilde were released soon after the crusaders left Hungary, and entered the Byzantine Empire in late November. The crusaders reached Constantinople on 23December 1096. The Byzantine Emperor Alexios I Komnenos demanded an oath of allegiance from their leaders and imposed