The greatest and most enduring achievement of Frontenac's first term was the exploration of the territory southwestward of the Great Lakes and the planting of French influence there. This work was due, in large part, to the courage and energy of the intrepid La Salle. Rene-Robert Cavelier, Sieur de La Salle, like so many others who followed the fleur-de-lis into the recesses of the new continent, was of Norman birth and lineage. Rouen was the town of his nativity; the year 1643 probably the date of his birth.