From the founding of the Church to the era of the Reformation. This is an informative, interestingly written and logically structured narrative about real people, as well as the most important events and ideas that determined the life and identity of the Church in the first fifteen centuries of its existence. The author shows how various social, political and economic movements influenced the internal development of Christianity. He cites facts from the lives of prominent personalities - from the apostles to John Wycliffe, and examines the essence of the most important theological issues and related discussions.