See edition (1900) of his journal in the Jesuit Relations; C. R. Stein, The Story of Marquette and Jolliet (1981).
Father Marquette was born in Laon, France, and joined the Society of Jesus at age seventeen. After working and teaching in France for several years, he was dispatched to Quebec in 1666 to preach to the Native Americans, where he showed great proficiency in the local languages, especially Huron. In 1668 Father Marquette (French: Père Marquette) was redeployed by his superiors to missions farther up the St. Lawrence River in the western Great Lakes. He worked at Sault Ste. Marie and at the Mission of the Holy Spirit in La Pointe, on Lake Superior, near the present-day city of Ashland, Wisconsin. Here, he came into contact with members of the Illinois tribes, who told him of the existence of the Mississippi River and invited him to come teach further south. Because of wars between the Hurons at La Pointe and the neighboring Dakota people, however, Father Marquette had to relocate to the Straits of Mackinac; he informed his superiors about the rumored river and requested permission to explore it.
Leave was granted, and in 1673, Marquette was joined by Louis Joliet, a French Canadian explorer. They departed from St. Ignace on May 17, with two canoes and five other voyageurs of French-Indian ancestry. They followed Lake Michigan to the Bay of Green Bay and up the Fox River. From there, they portaged to the Wisconsin River, which they were told led to the river they sought. On June 17, they entered the Mississippi near Prairie du Chien.
The Joliet-Marquette expedition traveled to within 435 miles (700 km) of the Gulf of Mexico but turned back at the mouth of the Arkansas River. By this point they had encountered several natives carrying European trinkets, and they feared an encounter with explorers or colonists from Spain. They followed the Mississippi back to the mouth of the Illinois River, which they learned from local natives was a shorter route back to the Great Lakes. They returned to Lake Michigan near the location of modern-day Chicago. Marquette stopped at the mission of St. Francis Xavier in Green Bay in September, while Joliet returned to Quebec to relate the news of their discoveries.
Marquette and his party returned to the Illinois Territory in late 1674, becoming the first Europeans to winter in what would become the city of Chicago. In the spring of 1675, the missionary again paddled westward and celebrated a public Mass at the Grand Village of the Illinois near Starved Rock. A bout of dysentery picked up during the Mississippi expedition, however, had sapped his health. On the return trip to St. Ignace, he died near the modern town of Ludington, Michigan.
There is a Michigan Historical Marker at this location that reads
Father Jacques Marquette, the great Jesuit missionary and explorer, died and was buried by two French companions somewhere along the Lake Michigan shore on May 18, 1675. He had been returning to his mission at St. Ignace which he had left in 1673 to go exploring in the Mississippi country. The exact location of his death has long been a subject of controversy. A spot close to the southeast slope of this hill, near the ancient outlet of the Pere Marquette River, corresponds with the death site as located by early French accounts and maps and a constant tradition of the past. Marquette's remains were reburied at St. Ignace in 1677.
His grave is now located at what is currently the Ojibway Museum on State Street in downtown St. Ignace. Father Marquette is memorialized in several towns and rivers that bear his name (such as Marquette, Michigan), as well as the Father Marquette National Memorial near St. Ignace.