Krak des Chevaliers

When the Crusaders marched on Jerusalem, the castle was abandoned.

An excerpt from the article 17 facts about Krak des Chevaliers

It was captured again in 1110 by Tancred, the nephew of one of the leaders of the First Crusade, the prince of Antioch, and in 1142, Raymond II, count of Tripoli, gave it to the Order of the Hospitallers.