Sieur de La Vérendrye built the first fur trading post on the site in 1738, called Fort Rouge. French trading continued at this site for several decades before the arrival of the British Hudson's Bay Company after France ceded the territory following its defeat in the Seven Years' War. Many French men who were trappers married First Nations women; their mixed-race children hunted, traded, and lived in the area. They gradually developed as an ethnicity known as the Métis because of sharing a traditional culture.