Zayd ibn Ali
Muslims in Yemen include the majority Shafi'i (Sunni) and the minority Zaidi (Shia). Zaidi are sometimes called "Fiver Shia" instead of Twelver Shia because they recognize the first four of the Twelve Imams but accept Zayd ibn Ali as their "Fifth Imām" rather than his brother Muhammad al-Baqir. Shia–Sunni conflict in Yemen involves the Shia insurgency in northern Yemen.