 Complete the following phrase:  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 Saladins reconquest of the city in 1187. The tower is known in Arabic as Qasr al-Jalud Goliaths Tower, and to the Crusaders as Turris Tancredi Latin for Tancreds Tower, after Tancred of Hauteville, the commander whose troops breached the Fatimid defenses at this specific point during the 