The book of the famous French religious scholar Franz Kumon "Eastern Religions in Roman Paganism" is a brilliant essay on the religious situation of the 2nd-5th centuries AD. The work offered to the reader describes in detail the history of each eastern cult from the moment it arose until its spread in the Roman Empire. A French researcher tried to reconstruct the main lines of interaction between Roman paganism and "aliens from the East." It will become clear to the reader who has read this book that only by immersing himself in the specific realities of that era will he be able to adequately assess the complexity and grandiosity of such a confrontation between many religions.