Louis Jolliet and Jacques Marquette were French explorers who were commissioned by the governor of Canada, Louis de Buade, Comte de Frontenac, to explore the Mississippi River and find a route to the Pacific Ocean. They set out from Montreal in May 1673 and traveled westward along the Great Lakes and the Mississippi River. They reached the mouth of the Arkansas River in July and decided to turn back, as they feared that they would be attacked by Spanish explorers who were also exploring the region.
Jolliet and Marquette's exploration was significant for several reasons. First, it provided the first detailed map of the Mississippi River and its tributaries. Second, it helped to establish the French claim to the Mississippi Valley and the Great Lakes region. Third, it opened up the region to further exploration and settlement by Europeans.