The site of what later became the city of Saginaw was originally inhabited by the Anishnabeg. French missionaries and traders first appeared in the area during the late 17th century and encountered the Ojibwe (Chippewa) living in the area. Because of convenient means of travel to the area by rivers, streams, and Lake Huron, the area was one of the sites of councils of The Three Fires: Ojibwe, Pottawatomi, and Ottawa. Henri Nouvel, a Jesuit missionary visited the area in the 17th century and recorded his travels in a journal. A trading post was established by Louis Campeau in 1816. The Treaty of Saginaw in 1819 cleared the way for settlement by white people. To control the Ojibwe in the region, the United States government established Fort Saginaw in 1822, but the mosquito infestation and humidity was so severe that the fort was closed in 1824. Campau platted a town, but few lots were sold for some time. Also in 1822, Saginaw County was established.