Castellum Belveer by hadassah | May 6, 2008 | Bible and Beyond In what is today Mevasseret Zion, the Crusaders built a fortress on the ruins of a Roman fortress called Castellum. During the War of Independence, this strategic point was the site of a famous battle. See also- The Castel, Apr. 1948 Armored Vehicle from the Castel Memorial for Fallen Soldiers at the Castel, Dec. 1947-Apr. 1948.