1631 – Earl Johann Tilly attacks Maagdenburg
1814 – Norwegian constitution passed by constitutent assembly at Eidsvoll
1881 – 7th Kentucky Derby: Jim McLaughlin aboard Hindoo wins in 2:40
1911 – 36th Preakness: Eddie Dugan aboard Watervale wins in 1:51
1919 – UK War Department orders use of National Star Insignia on all airplanes
1940 – Germany occupies Brussels, Belgium and begins invasion of France
1975 – 10CC releases “I’m Not in Love”
1992 – LPGA Championship, Bethesda CC: Betsy King wins her 5th major title, 11 strokes ahead of runners-up JoAnne Carner, Liselotte Neumann and Karen Noble
1993 – Intel’s new Pentium processor is unveiled
2004 – Massachusetts becomes the first U.S. state to legalize same-sex marriage