Prior to the advent of the Almoravids in the 11th century, the area was ruled from the city of Aghmat. The Almoravid leader, Abu-Bakr Ibn-Umar decided Aghmat was becoming overcrowded and chose to build a new capital. He decided to build it in the plains near the Tansift river. He chose the site of Marrakech, because it was in neutral territory between two tribes who were vying for the honor of hosting the new capital.[citation needed] Work sta...