In 1604, a North American fur trade monopoly was granted to Pierre Du Gua, Sieur de Mons. The fur trade became one of the main economic ventures in North America. Du Gua led his first colonization expedition to an island located near the mouth of the St. Croix River. Among his lieutenants was a geographer named Samuel de Champlain, who promptly carried out a major exploration of the northeastern coastline of what is now the United States. In the spring of 1605, under Samuel de Champlain, the new St. Croix settlement was moved to Port Royal (today's Annapolis Royal, Nova Scotia). Samuel de Champlain also landed at Saint John Harbour on June 24, 1604 (the feast of St. John the Baptist) and is where the city of Saint John, New Brunswick, and the Saint John River gets their name.