The Igreja (church) of São João Evangelista (a.k.a. Church of the Lóios) was founded in 1485 and belonged to the convent of the Order of Saint Eligius (Lóios is a corrupted form of the Portuguese word for Eligius). Saint Eligius is the patron saint of goldsmiths and horses (he is credited with shoeing a nervous horse by cutting off its foreleg, re-shoding the hood, and re-attaching the amputated leg to the horse). Like the adjacent Palácio Cadaval, the church stands on the ruins of an old Moorish castle destroyed in the 14th century. The Gothic entrance belongs to the late 15th century. The church is the final resting place for many members of the Cadaval family, including Dom Rui de Sousa, who was the Portuguese ambassador to the Spanish court during the Treaty of Tordesillas in 1491 (the treaty divided the newly discovered lands of the Americas between Portugal and Spain).