878 – Battle of Edington: Alfred the Great and his West Saxon army defeat Viking army of Guthrum the Old [earliest possible date]
1787 – 1st African American Masonic Lodge (African # 459) forms Prince Hall, Boston
1853 – 1st major US rail disaster kills 46 at Norwalk, Connecticut
1934 – MLB Boston Red Sox score 12 runs in 4th inning, including record 4 consecutive triples hit by Carl Reynolds, Moose Solters, Rick Ferrell, and B Walters
1944 – 70th Kentucky Derby: Conn McCreary aboard Pensive wins in 2:04.2
1975 – 3 people die in tornado that strikes Omaha, Nebraska
1978 – 104th Kentucky Derby: Steve Cauthen wins aboard Affirmed – first and only Derby victory and 1st-leg of Triple Crown
1987 – Mario Andretti sets one-lap speed record at Indy at 218.204 MPH
1996 – Howard Stern Radio Show premieres in Hartford, Connecticut on WCCC 106.9 FM
2012 – Greek parliamentary election results in 60% support for parties opposed to austerity measures