Ali Ibn Abi-Talib

Ali (Alī ibn Abī Ṭālib) (علي بن أﺑﻲ طالب)‎ (599 – 661) was an early Islamic leader. He is revered by Sunni Muslims as the last of the four 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.