The book contains more than two hundred biographies, arranged by name in alphabetical order, under numbers, which allows you to quickly find the necessary information, trace family ties, and build a family tree. The value of the book also lies in the fact that it contains purely factual information, which in itself testifies to the degree of significance of a particular ruler and does not impose on the reader assessments of their activities. In his research, M. D. Khmyrov was based on numerous and solid sources (their list is placed at the end of the book).