Louis Jolliet
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![Ca. 1681 map of Marquette and Jolliet's 1673 expedition.](/Images/godic/202501/25/Marquette_and_jolliet_map_16813652.jpg")
Louis Jolliet (September 21, 1645 –last seen May 1700) was a French Canadian explorer known for his discoveries in North America. Jolliet and Jesuit Father Jacques Marquette, a Catholic priest and missionary, were the first non-Natives to explore and map the Mississippi River in 1673.