Fāṭima bint al-Ḥasan ibn ʿAlī (Arabic: فاطمة بنت الحسن بن علي), fl. 7th century, was a daughter of Hasan ibn Ali and Umm Ishaq bint Talha.^[1] She was married to Ali ibn Husayn Zayn al-Abidin (the fourth Shi'ite Imam), and became the mother of Muhammad al-Baqir (the fifth Twelver Imam). Her kunya was Umm ʿAbd Allāh^[2] and she was referred to as al-Ṣiddīqa ("the very truthful one") by her husband Ali.^[3] It has also been reported that her features were such, that no one in the family of Hasan ibn Ali looked like her.^[4]