Fī uṣūl al-dīn al-masīḥī
'On the fundamentals of the Christian religion'
Date: Late 12th or early 13th century
Original Language: Arabic
We are not certain of the original title of the work from which al-Muʾtaman ibn al-ʿAssāl extracted a couple of pages in his Majmūʿ uṣūl al-dīn; al-Muʾtaman speaks of Muṣṭafā l-Mulk’s discourse fī kitābihi alladhī ṣanafahu fī uṣūl al-dīn al-masīḥī, ‘in his book which he composed on the fundamentals…