The Berbers (autonym: Imazighen) are an indigenous ethnic group of the Maghreb region of North Africa. Following the Muslim conquest of the Maghreb, most Berber tribes eventually became Muslims, and today Arab-Berber (of mixed Arab and Berber ancestry) and Arabized Berbers (Berbers who have assimilated into the Arab population). Presently, about one-sixth of the population of Maghreb speaks one of the Berber languages (mostly in Algeria and Morocco), but most of them also speak some form of Arabic.
The region of North Africa practiced many religions including various forms of pagan rituals, Judaism, and Christianity. The first Islamic forces encountered fierce opposition by the various city-states resulting from the departure of the Byzantines. The weakest of them in the southern and southwestern parts of the Berber territory were the first to fall to the Islamic troops under the Egyptian Caliph in a locally initiated attempt of expansion westward. This first attempt in late 7th century (660 A.D.) resulted in a decisive defeat of the Islamic troops. In 750 the caliphs centralized their command in Damascus and a coalition of Islamic forces from Medina, Damascus, Baghdad and Egypt returned in a second attempt following successive defeats in Greece. The Islamic forces in a coalition resumed their conquest of the Mediterranean Sea from the south, through North Africa. A more diplomatic second attempt resulted in a successful alliance with the mainly desert-based Mauretanian tribes (south and west of modern Algeria) then Numidia. The new Muslim northwest African tribes in turn became ambassadors of the Muslim Caliphs, and brokers on their behalf in an attempt to assemble a coalition of forces to engage their common enemy Rome. The new approach was better received by the Numidian tribes of the highlands and were successfully recruited for a joint military venture into Europe and ultimately to Rome and around the Mediterranean Sea. A Numidian chief, Tariq ibn Ziyad, headed these stronger forces under the green flag of Islam and embarked for Europe, taking over most of the Iberian Peninsula. It is then that North Africa west of Egypt was referred to as "al-Maghreb" or the "West" by the peoples of the Middle East.