The Hammadids will rule from 1011 to 1151, during which time Bejaïa becomes the most important port in North Africa.

This period is marked by constant conflict, political instability, and economic decline.

The Hammadids, by rejecting the Ismaili doctrine for Sunni orthodoxy and renouncing submission to the Fatimids, initiate chronic conflict with the Zirids.

Two great Berber confederations—the Sanhaja and the Zenata—engage in an epic struggle.

The fiercely brave, camelborne nomads of the western desert and steppe as well as the sedentary farmers of the Kabylie to the east swear allegiance to the Sanhaja.

Their traditional enemies, the Zenata, are tough, resourceful horsemen from the cold plateau of the northern interior of Morocco and the western Tell in Algeria.

In addition, raiders from Genoa, Pisa, and Norman Sicily attack ports and disrupt coastal trade.

Trans-Saharan trade shifts to Fatimid Egypt and to routes in the west leading to Spanish markets.

The countryside is being overtaxed by growing cities.