IBN SAD [Abu `Abdallah Mohammed ibn Sa`d ibn Mani' uz-Zuhri, often called Katib ul-Waqidi ("secretary of Waqidi") of Basra] (d. 845), Arabian biographer, lived chiefly in Baghdad. His Kitab ul-Tabaqat ul-Kabir (15 vols.) contains the lives of Mahomet, his Companions and Helpers and of the following generation.
It has been edited under the superintendence of E. Sachau (Leiden, 1904 sqq.) ; cf. O. Loth, Das Classenbuch des Ibn Sa`d (Leipzig, 1869).