Controversies in Church History is back with a new series. This time, we delve into the history of Catholic Liberalism, a movement that began in the French Church in the early 1800s, and whose influence touched most of Europe and even the United States during the nineteenth century. This movement sought to reconcile the Church to modern society in France, was condemned by the papacy more than once, and left a lasting impact on the Church. In this episode, we discuss what Catholic Liberalism as a movement sought to achieve, its main intellectual sources, and key terms that will help us understand this important, and still very relevant, episode in the life of the Catholic Church.