Ahmad ibn Isa ibn Zayd
Aḥmad ibn ʿĪsā ibn Zayd (Arabic: أحمد بن عیسی بن زید; born 774 or later – died 854 or 861) Islamic theologian, Hadith scholar and Faqih, was the grandson of Zayd ibn Ali, one of the famous Alids of the early Abbasid Caliphate and one of the famous Zaydiyyah scholars who lived most of his life on the run. His kunya was Abū ʿAbd Allāh and his nickname was Al-Mukhtafī (lit. 'the hidden').