an Entity references as follows:
Abū Muḥammad ʿAbd Allāh/ʿUbayd Allāh ibn al-Ḥusayn (Arabic: أبو محمد عبد الله\عبيد الله بن الحسين المهدي بالله), 873 – 4 March 934, better known by his regnal name al-Mahdi Billah, was the founder of the Isma'ili Fatimid Caliphate, the only major Shi'a caliphate in Islamic history, and the eleventh Imam of the Isma'ili faith.