In this book, the reader will get acquainted with unknown pages of Slavic history. Our entire history, especially ancient history, is distorted and falsified beyond recognition, and it is with great difficulty that we recognize in the altered words the names of the numerous Slavic tribes of our ancestors; many facts, entire millennia of the life of our people were attributed to other countries, even many Gods of the Slavs were given to other peoples under changed names. But, be that as it may, many now unknown facts of our history were already known to scientists of the 19th century, on which we we rely on and with the research of which we introduce the reader. The author examines versions of the origin of the first alphabetic alphabet and comes to unexpected conclusions. The work provides the latest research on the Proto-Slavic alphabet, provides sensational information and rules recently derived by the Russian scientist L. N. Ryzhkov, according to which a certain part of the Latin words can be read in Russian, thereby proving that it is the Proto-Slavic language that underlies Latin and other European languages.