Most probably the first person to explore Illinois was a Native American descended from the people who came to North America from Asia. As we have no record of exactly when the first person visited Illinois, we can't know his/her name.
The first Europeans to come to Illinois were fur trappers in the Ohio Valley. In 1673, Father Pierre Marquette and Louis Joliet (Jolliet) traveled down the Mississippi River from the Great Lakes, and traveled along what is now the Illinois River.
Louis Jolliet and Jacques Marquette were some of the first Europeans to explore Illinois.
la salle
Pere Marquette and Louis Joliet were the first two Europeans in Illinois.
John Cabot was the first person to explore the new world for England.
roald amundsen
John Batman
Robert Peary
For exploring and to first map the Mississippi river.And to explore parts of Illinois and Wisconsin.
Robert Peary
Robert Campbell
Cartier
Pioneer