The book "Re-found evidence of the activities of Constantine the Philosopher" by I. In. Yagia is a unique study that immerses the reader in the world of medieval Slavic culture and history. This work is not just a scientific work, but a fascinating journey into the past, where each paragraph is filled with mysteries and discoveries that can interest both specialists and lovers of history. Constantine the Philosopher, better known as Cyril, is one of the key figures in the history of the Slavic world. His activities related to the creation of Slavic writing and the spread of Christianity among the Slavic peoples left an indelible mark on culture and language. In his book, Yagich explores new evidence that sheds light on the life and activities of this outstanding person. The author uses a wide range of sources, including archival materials, historical chronicles and literary works, which makes his research particularly valuable. The book will be of interest not only to historians and philologists, but also to everyone who is fond of the culture and language of the Slavic peoples. It is suitable for both students of history and those who just want to expand their knowledge of Slavic culture. Readers interested in topics of linguistic heritage, religious history and cultural identity will find in this work many fascinating facts and deep reflections. One of the central themes of the book is the influence of Constantine the Philosopher on the formation of Slavic identity. Yagich raises questions about how language and writing can become the basis for national identity. He analyzes how the activities of Cyril and his brother Methodius contributed to the cultural integration of the Slavic peoples and their rapprochement with Christian civilization. This study not only deepens the understanding of the historical context, but also makes us think about the importance of language as a tool that forms culture and identity. Style and . In. Yagia is distinguished by depth of analysis and accessibility of presentation. He is able to combine a scientific approach with a living language, which makes his books fascinating for a wide audience. Yagich is the author of many works on Slavic philology and history, and his name has already become synonymous with qualitative research in this area. Readers familiar with his previous works will find in the Newly Found Testimony the same insight and passion for his work. The book also addresses issues related to modernity, such as the preservation of linguistic heritage and its importance in the context of globalization. Yagich raises important questions about how modern Slavic peoples can maintain their uniqueness and identity in a rapidly changing world. This makes the work relevant and important for the modern reader seeking to understand his place in the cultural context. In conclusion, “The newly found evidence of the activities of Constantine the Philosopher” is not just a scientific work, but a real find for everyone who is interested in the history, culture and language of the Slavic peoples. The book offers in-depth analysis and new perspectives on known events, making them more understandable and relevant to the modern reader. This work must necessarily take a place on the shelf of everyone who appreciates the richness of Slavic culture and seeks to understand its roots.