Ḥasan ibn ʿAli ibn Abī Ṭālib (, 625–670 CE), commonly called Hasan, was the second Shiite Imam, succeeding his father Ali and preceding his younger brother Husayn ibn Ali. He was the elder son of Ali and Muhammad's daughter, Fatimah. Muslims respect him as the grandson of Muhammad and a member of Ahl al-Bayt and Ahl al-Kisa. After the death of his father, Hasan also succeeded him as Rashidun Caliph. He abdicated after six or seven months, and Muawiyah, who became the first Umayyad Caliph, succeeded him. For the rest of his life, Hasan lived in Medina in seclusion until he died at the age of 45 or 46, and was buried in the Al-Baqi' cemetery in Medina. His wife, Ja'da bint al-Ash'at is commonly accused of having poisoned him at the instigation of Muawiyah.