March 13:
A.D. 1519: Cortez lands in Mexico.
A.D. 1781: Sir William Herschel discovers Uranus, but misidentifies it as a comet.
A.D. 1865: Jefferson Davis signs a bill permitting slaves to be used as soldiers.
A.D. 1900: In France, the workday for women and children is limited to eleven hours by law.