At the northwest corner of the Ottoman wall, archaeologists have discovered the meager remains of a large tower, c. 35x35 metres, probably first built in the 11th century during the Fatimid period, that fell to the Franks at the end of the First Crusade in 1099, and was apparently expanded by the Ayyubids after Saladin's reconquest of the city in 1187. The tower is known in Arabic as Qasr al-Jalud (Goliath's Tower), and to the Crusaders as Turris Tancredi (Latin for Tancred's Tower), after Tancred of Hauteville, the commander whose troops breached the Fatimid defenses at this specific point during the 1099 siege. The tower as well as the entire city wall were long destroyed by the time the Ottoman Turks built theirs, possibly since 1219 when Ayyubid ruler Al-Mu'azzam Isa razed most of the city fortifications.