The first part of this book covers the coinage of the era of the Messenger (Peace Be Upon Him) and the Islamic Caliphate, and begins with an introduction to the study of Islamic coinage and their significance, as well as how to benefit from them and use them to study Islamic history and civilization, as an official historical document that is, without doubt, issued by the State Mint House and under the auspices of the highest authority present in it, the Caliph or ruler.