Dresden has a long history as the capital and royal residence for the Electors and Kings of Saxony, who for centuries furnished the city with cultural and artistic splendour. The city was known as the Jewel Box, because of its baroque and rococo city centre. The controversial British and American bombing of Dresden in World War II towards the end of the war killed approximately 25,000, many of whom were civilians, and destroyed the entire city centre. The bombing gutted the city, as it did for other major German cities. After the war restoration work has helped to reconstruct parts of the historic inner city, including the Katholische Hofkirche, the Semper Oper and the Dresdner Frauenkirche as well as the suburbs.