Baldwin I was a major military leader during the First Crusades. This skirmish at the end of the 11th century sought to recapture the Holy Lands from the Muslims. He built the Montreal Castle while he was the King of Jerusalem from 1100 until 1118. The fortress was originally called Mons Realis or Royal Mountain. It was the first of several Crusader castles constructed during this period in present day Jordan. This network of citadels controlled all movements of travelers from Syria to either Arabia or Egypt.