A member of the House of Ibelin, he was a son of Guy, constable of Cyprus, and a brother of Queen Isabella.

[1] In 1277, Nicholas Aleman, lord of Caesarea, murdered Baldwin's brother John in a feud.

In revenge, Baldwin, by then already constable, killed Nicholas, who happened to be married to a distant cousin, Isabella, daughter of John II of Beirut.

[2] On 24 June 1286, the teen-aged Henry II sailed to claim the Kingdom of Jerusalem.

[b] He was dead by January 1287, when Henry II endowed masses for his soul in the Cathedral of the Holy Wisdom, Nicosia.