When Queen Isabella I of Castile and King Ferdinand II of Aragon married in 1469, they unified the kingdoms of Spain. In 1492, the Catholic Monarchs adopted this coat of arms. The heraldic shield features symbols from Castile-León and Aragon plus the eagle of Saint John. This giant relief is on the side of a building by Arturo Melida for the School of Arts and Crafts. The institution was founded by Alfonso XII in 1881.