The book is dedicated to one of the most mysterious religions of the East - Yezidism. It examines the main religious ideas of the Yezidis, the peculiarities of the creed and cult, describes the caste-theocratic principle of dividing the traditional Yezidi society. The book contains a terminological dictionary, including the interpretation of more than 200 religious concepts, a list of Yezidi clans is attached.