Why is Saint Patrick the patron saint of engineers?

St. Patrick, as the patron saint of engineers, is credited with fostering the development of arts and crafts and introducing the knowledge of the use of lime as mortar in Ireland. He is also responsible for the initial construction of clay churches in Ireland in the 5th century A.D. Another of St. Patrick's achievements was teaching the Irish to build arches of lime mortar instead of dry masonry. These beginnings of ceramic work developed into organized crafts, and that's how St. Patrick became the patron saint of engineers.