Louis XVI was indicted for treason on this day in 1792. There's more detail in the November 19, 2008 episode of Stuff You Missed in History Class.
This Day in History Class
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California enacts the Alien Land Law - May 3rd, 1913
The "Battle of Alcatraz" begins - May 2nd, 1946
The world's first postage stamp is issued - May 1st, 1840