Abū Mūsā al-Murdār, ʿĪsā b. Ṣabīḥ (d. 226/841), was a Muʿtazilī theologian and one of the founders of the Baghdad School of kalām, whose followers were called the Murdāriyya. The (Persian) appellation murdār (lit. corpse), which is given in numerous sources (Ibn al-Rāwandī, 127; al-Sīrāfī, 47; al-Baghdādī, al-Farq, 100; al-Samʿānī, 12/187), was recorded in different forms (see al-Jāḥiẓ, al-Burṣān, 89; al-Masʿūdī, 7/233; al-Qāḍī ʿAbd al-Jabbār, 277; Ibn Ḥazm, 2/513; Ibn Ḥajar, 4/398). These vari…