Abd al-Rahman ibn Khaldun is the principal historian of the medieval Maghreb and one of the foundational figures of social science in any language tradition. Born in Tunis in 1332 to a family of Andalusi scholar-administrators that traced its lineage to a Yemeni Arab ancestor, he served successively at the courts of Tunis, Fez, Granada, Bijaya, Tlemcen, and Cairo, where he died in 1406.
His Kitab al-'Ibar — the "Book of Lessons" or "Book of Examples" — is a universal history in seven volumes whose introduction, the Muqaddimah, opens the work with a long methodological treatise on civilisation, the rise and fall of dynasties, the relationship between sedentary and nomadic populations, and the theory of social cohesion ('asabiyya) that he saw as the engine of dynastic change. The remaining volumes are the principal narrative source for the history of the Maghreb, including the most extensive surviving treatment of the Berber populations.
Ibn Khaldun's Berber sections — particularly the second and third books — provide the medieval taxonomy of the Berber confederations (Sanhaja, Zenata, Masmuda) that has shaped subsequent scholarship for six centuries. His sources combine personal observation across the western Maghreb, oral tradition collected from informants in the courts and the countryside, and the earlier Arabic geographical and historical literature.
His significance for modern Berber and Maghrebi studies is foundational. Twentieth-century French historians, beginning with William Marçais and continuing with Charles-André Julien, treated the Muqaddimah and the Berber books of the 'Ibar as the indispensable starting point for the medieval Maghreb; the subsequent generations of Maghrebi historiography in Arabic, French, English, and Berber have largely retained that estimation while revising particular Khaldunian framings.