Shaykh Tusi
Shaykh Tūsī (Persian: شیخ طوسی), full name Abū Jaʿfar Muḥammad ibn al-Ḥasan al-Tūsī (Arabic: أَبُوْ جَعْفَرِ مُحَمَّدُ بِنْ الحَسَنِ الطُوْسِّيّ, romanized: Abū Jaʿfar Muḥammad ibn al-Ḥasan al-Ṭūsī), known as Shaykh al-Ta'ifah (Arabic: شَيْخِ الطَائِفَةِ, romanized: Shaykh al-Ṭāʾifah) was a Twelver Shia Muslim scholar, jurist, mufassir, theologian and hadith compiler of Persian descent. He is the author of two of the Four Books of Shia hadith; namely, Tahdhib al-Ahkam and al-Istibsar, and is believed to have founded the Hawza of Najaf.