The remains of the 10th and 11th Shī‘ah Imāms, ‘Alī al-Hādī ("an-Naqī") and his son Hasan al-‘Askarī, known as: al-‘Askariyyain ("the two ‘Askarīs"), rest at the shrine.[4] Also buried within the Mosque are: Hakimah Khātūn, sister of ‘Alī al-Hādī; and Narjis Khātūn, the mother of Muħammad al-Mahdī.[5] 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.