Pope Pius XI

Pope Pius XI served as the head of the Roman Catholic Church from 1922 to 1939. He is known for promoting social justice through his encyclicals, addressing political issues of his time, including fascism and communism. His notable encyclical, "Quadragesimo Anno," emphasized the importance of the common good and critiqued economic inequalities. Pius XI also established the Vatican City's independence in 1929 through the Lateran Treaty with Italy. He played a significant role in fostering relations between the Church and the modern world, advocating for peace during the tumultuous interwar period.