The Theatines are a Roman Catholic religious order founded in 1524 by Saint Cajetan and others in Italy. Their primary mission is to promote spiritual renewal and reform within the Church, focusing on the education of clergy and laypeople. The order emphasizes a life of prayer, community, and service. The Theatines are known for their commitment to preaching and pastoral work. They established numerous churches and educational institutions across Europe and beyond. The order's members, called Theatine priests, wear a distinctive black cassock and are dedicated to living a life of simplicity and devotion to God.