For ten points, name this figure, a deliverer of justice and equity and bringer of a short golden age before the end of the world, whose name translates as "divinely guided one" or "messiah."
The Abbasid leaders of the effort to overthrow the Umayyad (oo-MY-ad) caliphs prophesized of a man who would rise in Khorasan in the east, carrying a black banner. Spanish Muslims told similar tales after their loss of most of Spain at Las Navas de Tolosa. Though invoked by Sunni Muslims, his place in Shi'ite eschatology is more pronounced, but nowhere is he mentioned in the Qur'an or in any known hadith of the Prophet. For ten points, name this figure, a deliverer of justice and equity and bringer of a short golden age before the end of the world, whose name translates as "divinely guided one" or "messiah."
The Abbasid leaders of the effort to overthrow the Umayyad (oo-MY-ad) caliphs prophesized of a man who would rise in Khorasan in the east, carrying a black banner.
{Mahdi}