Baldwin of Ibelin was the fourth of five sons of John I of Beirut and his second wife Melisende of Arsuf

Melisende of Arsuf

Melisende of Arsuf, Sovereign Dame of Arsuf, Lady of Beirut , was an heiress, and the second wife of the powerful Crusader noble John of Ibelin, the Old Lord of Beirut who led the opposition to Emperor Frederick II when he tried to impose Imperial authority in the kingdom of Jerusalem and the...

.

He commanded the third battaile

Battle (formation)

A battle or battaile was a medieval military formation, analogous and ancestral to the modern term battalion. In late medieval warfare, field armies were often drawn up into three main battles, also called guards: the vanguard, the middle guard, and the rearguard, often abbreviated to simply the...

at the Battle of Agridi

Battle of Agridi

The Battle of Agridi was fought in 15 June 1232 between the forces loyal to Henry I of Cyprus and the imperial army of Frederick II, composed mostly of men from Lombardy...

 in 1232. In 1246, he was appointed Seneschal of Cyprus

Officers of the Kingdom of Cyprus

The Kingdom of Cyprus, as an offshoot of the Kingdom of Jerusalem, maintained many of the same offices, such as: seneschal, constable, marshal, admiral, Chamberlain, and chancellor....

 and was taken captive at the Battle of Mansurah in 1250.

Baldwin married Alix, daughter of Walter III of Bethsan and Theodora Comnena Lathoumena. She was called la Seneschalece and she gave him six children:

• John, married Isabelle Rivet
• Philip, Constable of Cyprus
  Officers of the Kingdom of Cyprus
  The Kingdom of Cyprus, as an offshoot of the Kingdom of Jerusalem, maintained many of the same offices, such as: seneschal, constable, marshal, admiral, Chamberlain, and chancellor....
  
  
• Guy, married Maria, daughter of Hetoum I of Armenia and Zabel
• Balian, married Marguerite Visconte
• Hugh, regent of Cyprus in 1306
• Melisende, died young