Abu al-Fadl Muhammad bin Tahir bin Ali bin Ahmad al-Shaibani al-Maqdisi, commonly known as Ibn Tahir of Caesarea ("Ibn al-Qaisarani" in Arabic), was a Muslim historian and traditionist. He is largely credited with being the first to delineate and define the six canonical works of Sunni Islam after the Qur'an, and the first person to include Sunan ibn Majah as a canonical work.