The book by the famous Polish historian, author of many books on the history of early and medieval Christianity and Catholicism, introduces the reader to the official list and short biographies of the popes from the legendary Apostle Peter, who occupies the first position in the register, to John Paul I, listed at number 261. The book also mentions antipopes, that is, persons whose election to the papal throne was declared invalid by the church. In the introduction, the author introduces readers to the institution of the papacy and the main stages of its history. Translation from Polish by T. Trifonova.