This two-volume study explores the life of the Muslim scholar Ibn A'tham al-Kufi and his historical work, the Kitab al-futu? (Book of Conquests). This study re-contextualises Ibn A'tham within the early fourth/tenth century, highlighting his contributions to Islamic historiography. Volume 1 examines his biography, refines the timeline of his life and work, and traces its reception across the Muslim world. It provides codicological descriptions of the surviving Arabic manuscripts, analyses the narratives of the ridda ('apostasy') wars, and includes critical editions of the Kitab al-futu?'s collective isnads, accompanied by translations and analyses. Volume 2 presents a new critical edition of the work's opening sections, focusing on the saqifa and ridda narratives, based on manuscripts kept at Forschungsbibliothek Gotha (Germany) and Khuda Bakhsh Oriental Public Library in Patna (India).