Simón de Rojas was a 16th-century Spanish priest belonging to the Trinitarian Order. Born in Valladolid in 1552, he entered his religious order at the age of twelve and later pursued theological studies at the University of Salamanca. Throughout his career, he held several significant positions, including serving as a theology teacher in Toledo and acting as a tutor to the Spanish royal princes. He eventually served as the provincial of Castilla in 1621 and held the role of royal confessor.