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.
Meissen Cathedral The Meissen Cathedral or Church of St John and St Donatus (German: "Meißner Dom" ) is a Gothic church in Meissen in Saxony. It is situated on the castle hill of Meissen, adjacent to the Albrechtsburg castle. It was the episcopal see of the Bishopric of Meissen established by Emperor Otto I in 968. It replaced an older Romanesque church. The present-day hall church was built between 1260 and 1410, the interior features Gothic sculptures of founder Emperor Otto and his wife Adelaide of Italy as well as paintings from the studio of Lucas Cranach the Elder. The first Saxon elector from the House of Wettin, Margrave Frederick I, had the Prince's Chapel erected in 1425 as the burial place of his dynasty. The twin steeples were not attached until 1909.