Abū Ḥāmid Muḥammad ibn Muḥammad al-Ṭūsiyy al-Ghazali, known commonly as Al-Ghazali, known in Medieval Europe by the Latinized Algazelus or Algazel, was a Persian Sunni Muslim polymath. He is known as one of the most prominent and influential jurisconsults, legal theoreticians, muftis, philosophers, theologians, logicians and mystics in Islamic history.

ʾUṣūl al-fiqh or Principles of Islamic jurisprudence are traditional methodological principles used in Islamic jurisprudence (fiqh) for deriving the rulings of Islamic law (sharia).