The textbook on patrolology by candidate of theology priest Mikhail Legeev covers the period of patristic writing of the Ancient Church (I–III centuries). The book is structured on the principle of a chronological presentation of the material. The author's approach is based on a conceptual vision of the historical development of patristic thought as a whole. Each topic presented, dedicated to any of the outstanding fathers and teachers of the Church, reflects the most striking, characteristic features of their work. The manual is focused on the study of patristic texts and contains an extensive anthology as an appendix. Thematic material allows you to quickly move from the educational section to the corresponding text of the anthology. The textbook is addressed to teachers and students of theological educational institutions, theological faculties of secular universities, as well as readers interested in the historical development of church thought.