Jacques Marquette was born on June 1st 1637, in Laon, France. He was sent as a missionary to convert the native people to Christianity. He eventually ended up in the Great Lakes region, but left the mission and chose to explore with Joliet.
He began his expedition in 1673. He and Joliet sailed in Lake Michigan, up through Green Bay, and up the Fox River. They then carried their canoes for 2 miles and entered the Wisconsin river and eventually ended up in the Mississippi. They turned around at the mouth of the Arkansas River after seeing Native Americans. They were afraid of encountering explorers from Spain.
Marquette died in the spring of 1675 on the way back from an expedition. He had contracted dysentary on the Mississippi expedition. He was 37 years old.