XIII. Leó

Pope Leo XIII, who served from 1878 to 1903, is best known for his social encyclical 'Rerum Novarum,' which addressed the rights of workers and the conditions of the working class. He is often referred to as the 'Social Pope' for his efforts to reconcile modernity with traditional Catholic teachings. His papacy is marked by a focus on social justice, as well as significant reforms within the Church, including the promotion of biblical studies and the modernization of Church institutions. Leo XIII is remembered for his intellectual contributions and his attempts to guide the Church through the challenges of a rapidly changing world.