The Minangs are one of the world's largest matrilineal societies/cultures/ethnic groups, with a population of 4 million in their home province West Sumatra in Indonesia and about 4 million elsewhere, mostly in Indonesia. The Minang people are well known within their country for their tradition of matrilineality and for their "dedication to Islam" – despite Islam being "supposedly patrilineal". This well-known accommodation, between their traditional complex of customs, called adat, and their religion, was actually worked out to help end the Minangkabau 1821-37 Padri War. This source is available online.