The book is dedicated to the history of Islam and the first Muslim state, the caliphate, covering the period from 570 to 786. The reader will find in it an objective and reliable account of the activities of the prophet of Islam Muhammad, the formation of his teachings and the course of the Arab conquests that created a huge empire from the Pamirs to the Atlantic ocean, the legacy of which is vividly felt to this day. It is based on information from early Muslim authors, is reliable as a source of information, written in simple and clear language and may be of interest to both the widest reader and specialists in related fields of Oriental studies.