In what year was the cathedral, that Arnao de Vergara produced several windows for, registered as a World Heritage Site?
Seville Cathedral The Cathedral of Saint Mary of the See (Spanish: "Catedral de Santa María de la Sede" ), better known as Seville Cathedral, is a Roman Catholic cathedral in Seville (Andalusia, Spain). It was registered in 1987 by UNESCO as a World Heritage Site, along with the Alcázar palace complex and the General Archive of the Indies. "See" refers to the episcopal see, i.e., the bishop's ecclesiastical jurisdiction.
Basilica of San Vitale The "Basilica of San Vitale" is a church in Ravenna, Italy, and one of the most important examples of early Christian Byzantine art and architecture in Europe. The Roman Catholic Church has designated the building a "basilica", the honorific title bestowed on church buildings of exceptional historic and ecclesial importance, although of course it is not of architectural basilica form. It is one of eight Ravenna structures inscribed on the UNESCO World Heritage List.