Baldwin II of Jerusalem

Baldwin II of Jerusalem (c. 1060 – 21 August 1131), formerly Baldwin II of Edessa, born Baldwin of Rethel, was the from 1100 to 1118 and  from 1118 to his death.

By 1119, Hugues de Payens, the leader of the secret Templar Order, planned to turn the organization public. He proposed to Baldwin that the Order be founded to protect pilgrims traveling to the Holy Land. Approving this, Baldwin gave Al-Aqsa Mosque to the Templars as a headquarters.

Reference

 * Assassin's Creed: Revelations - Abstergo Files