Upon his return to Québec, Jolliet was denied a fur concession he sought for the Illinois area and joined his father-in-law about 1676 in a company trading at Sept-Îles.
Jolliet, LouisLouis Jolliet, explorer, cartographer, king's hydrographer, fur trader, seigneur, organist (bap at Québec 21 Sept 1645; d near Île d'Anticosti late summer 1700), best known as the co-discoverer of the Mississippi. In 1656 Jolliet entered the Jesuit college at Québec where he studied for the priesthood and became an accomplished organist. He took his minor orders in 1662 but left in 1667 to become a fur trader. In 1672 he was chosen by Intendant Jean TALON to lead an expedition to determine whether the Mississippi, known from native accounts, flowed into the Gulf of Mexico or the Pacific Ocean. By 17 June 1673, Jolliet, with Father MARQUETTE and 5 others, was on the Mississippi and in mid-July he reached 33°40´ N lat near the mouth of the Arkansas River, sufficiently far south to prove that the river flowed into the Gulf of Mexico.
Upon his return to Québec, Jolliet was denied a fur concession he sought for the Illinois area and joined his father-in-law about 1676 in a company trading at Sept-Îles. In March 1679 Jolliet was granted a trade concession at MINGAN in the Gulf of St Lawrence to which Île d'Anticosti was added in 1680. After an overland voyage to Hudson Bay in 1679, Jolliet concentrated on trade and fisheries at his concession until 2 raids by the English in 1690 and 1692 dealt him a financial blow from which he never recovered. Jolliet was commissioned in 1694 to chart the Labrador coast, a task he accomplished to 56°8´ N lat near the present Zoar. In 1697 he succeeded Jean-Baptiste-Louis FRANQUELIN as king's hydrographer and teacher of navigation.