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 III, Count of Flanders Arnulf II, with Arnulf I acting as regent until his own death. Then Baldwin Balso continued as the regent for the child. During his short rule, Baldwin was responsible for establishing the wool manufacturing industry at Ghent and markets at other towns in Flanders. Baldwin III died on 1 January 962. After Baldwin's death, Arnulf I arranged for King Lothair of France to become the guardian of Baldwin's son Arnulf II. "Shortly before 961" Baldwin married Mathilde of Saxony († 1008), daughter of Hermann Billung(† 973), Duke of Saxony. They had a son, Baldwin's heir: <br> Baldwin III, Count of