He was at the fall of Antioch, and settled in the town with the other crusaders. He met Mariam, a young sarazine, their love lasted one year, then Cadfael was forced to left her to participate to the siege of Jerusalem.
He was just 20 years old when Jerusalem fell, serving as a man-at-arms under the force of Robert of Normandy. Before leaving, he returned for a brief while to Mariam, before finally sailing off. Unknown to him, this brief encounter lead to a son. As a sailor, he travelled around the Mediterranean, visiting places such as Turkey and Italy.