This extensive works describes the mission of Saint Peter after the ascension of Christ, emphasizing his leadership in spreading Christianity. Upon arriving in Rome, Peter sends disciples to various cities to establish the faith, notably appointing Clement in Mediomatricum (Metz). Clement's preaching leads to the conversion of many from idol worship to true faith. The text also mentions the subsequent leaders of the Church, their contributions, and miraculous events associated with them, illustrating the growth of the Christian community despite the obscurity of some historical details. What follows is an account of the various bishops of the city of Metz in the subsequent centuries.