 Al-Bayhaqi

Abū Bakr Aḥmad ibn Ḥusayn Ibn 'Alī ibn Mūsa al-Khosrojerdi al-Bayhaqi (Arabic) , البيهقي also known as Imām al-Bayhaqi was born 994 CE/384 AH in the small town of Khosrowjerd near Sabzevar, then known as Bayhaq, in Khurasan.During his lifetime, he became a famous Sunni hadith expert, following the Shafi'i school in fiqh and the Ash'ari school of Islamic Theology.