Camillus de Lellis was a 16th-century Italian priest and nurse who dedicated his life to medical service. Born in Bucchianico in 1550, he initially served in the Venetian army before undergoing a religious conversion in Manfredonia in 1575. Following his ordination as a priest in 1584, he established the Clerics Regular of the Ministers of the Sick. This religious order focused on providing specialized care for the ill, fundamentally changing how hospitals operated in Rome and beyond.