The proposed history of the Caliphate, designed for four volumes, aims to give a coherent general picture of the history of the Caliphate, from the birth of Islam to the middle of the 10th century, based on the study of material from Arabic written sources and taking into account modern achievements of historical science, with special attention to the problems of culture and economics. Volume I. Islam in Arabia (570-633) - the origin and formation of Islam during the preaching of Muhammad and the formation under his first successor of the Muslim state, the Caliphate, in Arabia are considered. Volume II. The Era of the Great Conquests (633-656) - sets out the course of the Arab conquests outside the Arabian Peninsula before the assassination of Caliph Uthman. Considerable attention is paid to the socio-economic problems of this short but important period in the history of the Muslim state. Volume III. between the two civil wars (656-696) deals with an era of violent religious and political struggle within the Muslim state. The events considered in this volume had a decisive impact on the addition of the ideology of Shiism, although its design took place somewhat later. Abdalmalik's reforms were chosen as the upper limit of the period under consideration, marking the transformation of the Caliphate into a state with its own administrative and fiscal system. Volume IV. Apogee and the Fall of the Arab Caliphate (695-750) - sets out the events of 695-750. This was the period of the highest external power of a single Muslim state, pushing its borders to Southern Gaul, Fergana and the Indus Valley, but gradually losing internal unity under pressure from opposition movements - Shiite, Kharijite and Abbasid. The upper limit of this period was determined by the uprising of Abbasid supporters who replaced the Umayyad dynasty.