Algeria
Islam is the predominant religion in Algeria, with its adherents, mostly Sunnis, accounting for 99% of the population according to a 2012 CIA World Factbook estimate, and 97.9% according to Pew Research in 2010. There are about 150,000 Ibadis in the M'zab Valley in the region of Ghardaia.
Medieval Muslim Algeria
Medieval Muslim Algeria was a period of Muslim dominance in Algeria during the Middle Ages, roughly spanning the millennium from the 7th century to the 17th century. Unlike the invasions of previous religions and cultures, the coming of Islam, which was spread by Arabs, was to have pervasive and long-lasting effects on North Africa. The new faith, in its various forms, would penetrate nearly all segments of society, bringing with it armies, learned men, and fervent mystics; in large part, it would replace tribal practices and loyalties with new social norms and political idioms.