North Rhine-Westphalia German: Nordrhein-Westfalen usually shortened to NRW, is the westernmost, most populous, and economically most powerful state of Germany with four of the country’s ten largest cities. The state was a merger of the north part of the Rhineland, Westphalia and Lippe – its capital is Düsseldorf. The flag of North Rhine-Westphalia is green-white-red with the combined coats of arms of the Rhineland (white line before green background, symbolizing the river Rhine), Westfalen (the white horse) and Lippe (the red rose). According to legend the horse in the Westphalian coat of arms is the horse that the Saxon leader Widukind rode after his baptism. Other theories attribute the horse to Henry the Lion. Some connect it with the Germanic rulers Hengist and Horsa.The state is not known for its castles like other regions in Germany. However, North Rhine-Westphalia has a high concentration of museums, cultural centres, concert halls and theatres .