 Al-Bayhaqi's full name is أحمد بن الحسين بن علي بن موسى الخراساني البيهقي المشهور بالبيهقي.Al-Bayhaqi was a scholar of "fiqh" of the Shafi'i school of thought, as well as of that of hadith.He studied "fiqh" under Abū al-Fatḥ Nāṣir ibn al-Ḥusayn ibn Muḥammad al-Naysaburi as well as Abul Hasan Hankari.