In the early 12th century they defeated the Almoravids and took control of Tlemcen. During the reign of al-Mansur's son Abd al-Aziz ibn Mansur, Bougie had about 100,000 people, and the Hammadids consolidated their power in the city. The dynasty suffered a decline after this point; efforts to develop more sea power in the Mediterranean were foiled by the Normans, who by the 12th century had conquered Sicily and had also occupied a number of settlements on the coast of Tunisia and Algeria. However, Abd al-Aziz did expel the Hilalians from Hodna and capture Jerba.