DescriptionSettlement of the region around Prairie du Rocher began in 1722 as a speculative land venture. Prairie du Rocher is thought to be the oldest town in Illinois. John Law obtained a charter that awarded him jurisdiction over the Louisiana Purchase; he promoted the area and pledged large profits to the French who speculated on the land. Within 2 years the venture failed, leaving the French financial system in ruin. The colonists sent to the area, however, remained.
Things to SeeFort de Chartres State Historic Site