Glasgow Cathedral (Scottish Gaelic: Cathair-eaglais Ghlaschu) is a parish church of the Church of Scotland in Glasgow, Scotland. It is the oldest cathedral in mainland Scotland and the oldest building in Glasgow.[nb 1] The cathedral was the seat of the Archbishop of Glasgow, and the mother church of the Archdiocese of Glasgow and the Province of Glasgow, until the Scottish Reformation in the 16th century. Glasgow Cathedral and St Magnus Cathedral in Orkney are the only medieval cathedrals in Scotland to have survived the Reformation virtually intact.[1]