Starting in the 1630's, the French presence at the mouth of the St. John River started to organize by erecting forts and trading posts. During the Grand Dérangement, British militaries imprisoned dozens of Acadians in one of the region's forts. In the 19th century, Saint John was a city with a very strong Anglophone majority, but still had a few dozen Acadian families. Today, approximately 6,000 Acadians and Francophones live there. Saint John even has a school and community centre that is named Samuel-de-Champlain in honour of famous French mapmaker and explorer who named the St. John River on June 24, 1604.