In the summer of 1541, after arriving on his third and final voyage, Jacques Cartier established a French colony of 400 people at present-day Cap-Rouge named Fort Charlesbourg Royal. It consisted of an upper fort, and lower fort located near the mouth of Cap-Rouge river. The upper fort, constructed at an elevation of 40 metres, offered a strategic defensive position, while the lower fort provided a potential anchorage for ships. The two forts had three towers. Charlesbourg Royale was named after Charles II, Duke of Orleans, third son of King Francis I of France.