History of the Popes: from Saint Peter to Leo XIV The aim of this work is not merely to recount a succession of names, dates, and events, but to offer a comprehensive vision of the papacy as a living institution—ever evolving and deeply rooted in the mystery of the Christian faith. Each pope has been a unique witness to the Gospel in his time, with successes and failures, with lights and shadows, but always entrusted with the mission of being the spiritual guide of the Universal Church. This book is also an invitation to Catholic readers to rediscover the value of the Petrine ministry as a sign of unity, apostolic continuity, and doctrinal reference in times of uncertainty. For scholars, it provides a structured source for consultation and reflection. For believers, it offers an opportunity to deepen their understanding of the heart of ecclesial tradition. From the humble fisherman of Galilee to the current pontiff born in Chicago, this work gathers the testimony of faith, dedication, and hope that unites all popes under the same motto: Servus servorum Dei — Servant of the servants of God.