Pope Leo XIII, born Vincenzo Gioacchino Pecci, was Pope from 1878 to 1903. With his long pontificate at the end of the nineteenth century, he became a bridge figure between tradition and modernity. Whereas his predecessor had adopted a largely defensive stance toward the modern world, Leo XIII deliberately sought dialogue without compromising Catholic doctrine.

Leo XIII was known for his great intellectual interests. Under his leadership, the Vatican Archives were opened to scholarly research, an important step toward transparency and academic collaboration.

His name is inseparably linked with his famous encyclical Rerum Novarum (1891). In this document, he addressed the social problems arising from industrialization: poverty, the exploitation of workers, and the growing gap between rich and poor. He defended the right to private property, but at the same time recognized the right of workers to form associations and advocated for just wages and humane working conditions. In doing so, he laid the foundation for Catholic social teaching, an influence that continues to this day.

Leo XIII lived to the age of ninety-three, making him one of the oldest popes in history. His long life and thoughtful manner gave him an almost fatherly presence. He is remembered as a pope who did not shy away from the challenges of his time, but sought to understand and guide them through faith and reason.