On March 10, 1707 Antoine de Lamothe Cadillac gave the first known grants of land to French settlers in Detroit.
Source : Historical Society of Michigan.
For more information, see Cadillac and the founding of Detroit : commemorating the two hundred and seventy-fifth anniversary of the founding of the city of Detroit by Antoine Laumet de Lamothe Cadillac on July 24, 1701 by Henry D. Brown. … [et al.]. Detroit : Published for the Detroit Historical Society by Wayne State University Press, 1976.