Sé Nova means new cathedral, but this is only relatively speaking. The cathedral building dates back to the late 16th century and was built by the Jesuit Order. However, in 1759 were banned from operating in Portugal by then prime-minister, the Marquis de Pombal.
With this spacious, modern church now vacant it was decided in 1772 that the episcopal seat be transferred from the old Romanesque cathedral to here. Henceforth this was referred to as the Sé Nova (New Cathedral) and the older church the Sé Velha (Old Cathedral).