Fātimah bint al-Hasan ibn ‘Alī (Arabic: فاطمة بنت الـحسن بن علي) was a daughter of Hasan ibn ‘Alī, wife of ‘Alī ibn Husayn (fourth Twelver Imām), and mother of Muhammad al-Bāqir (fifth Twelver Imām). Her kunya was Umm ‘Abd Allāh and she was referred to as, "as-Siddīqa" ("the very truthful one") by ‘Alī ibn Husayn. It has also been reported that her features were such, that no one in the family of Hasan ibn ‘Alī looked like her.