Abū Bakr ibn al-Ḥasan ibn ʿAlī (Arabic: أبو بكر بن الحسن بن علي) was the son of Hasan ibn Ali.
Abu Bakr was a son of Hasan ibn Ali.
[1] Abu al-Faraj quotes from Al-Mada'ini, who through his chain of transmitters quotes from Abu Mikhnaf, and from Sulayman bin Rashid that Abu Bakr was martyred by an arrow shot fired by Abd Allah ibn Uqba al-Ghanawi.
[4] But Al-Tabari, Ibn Athir, Shaykh Mufid and others relate his martyrdom as occurring after that of Qasim.
[2] Abu Bakr's name is mentioned in Ziyarat al-Nahiya al-Muqaddasa and Ziyarat Rajabiyya and his murderer has been cursed.