The remains of the 10th and 11th Shī‘ah Imāms, ‘Alī al-Hādī and his son Hasan al-‘Askarī, known as: al-‘Askariyyain rest at the shrine. Also buried within the Mosque are: Hakimah Khātūn, sister of ‘Alī al-Hādī; and Narjis Khātūn, the mother of Muħammad al-Mahdī. Adjacent to this shrine is another mosque, built over the location where the Twelfth or "Hidden" Imām, Muħammad al-Mahdī first entered the Minor Occultation.