Alī ibn Abī Ṭālib (Arabic: عَلِي ابْن أَﺑِﻲ طَالِب, 599 – 661 ACE) was an early Islamic leader. Ali is revered by Sunni Muslims as the fourth Rightly Guided Caliphs, and as a foremost religious authority on the Qur'an and Fiqh (Islamic jurisprudence). Shi'a Muslims consider him the First Imam appointed by the Islamic prophet Muhammad and the first rightful caliph. Ali was the cousin of Muhammad, and after marriage to Fatimah he also became Muhammad's son-in-law. The Isaaq clan-family in Somaliland and Ethiopia claims descendant to Ali through its forefather Sheikh Ishaaq.