In 44 B.C., Roman dictator Julius Caesar was assassinated by a group of nobles that included Brutus and Cassius.
1820: Maine became the 23rd state.
1916: A U.S. expeditionary force led by Brig. Gen. John J. Pershing entered Mexico on an ultimately futile mission to capture Pancho Villa, whose raiders had attacked Columbus, New Mexico, killing 18 U.S. citizens.
1956: The Lerner and Loewe musical play "My Fair Lady," based on Bernard Shaw's "Pygmalion," opened on Broadway.
1966: At the 8th Annual Grammy Awards, "A Taste of Honey," performed by Herb Alpert & the Tijuana Brass, was named Record of the Year, while Frank Sinatra's "September of My Years" won Album of the Year.
1985: The first Internet domain name, symbolics.com, was registered by the Symbolics Computer Corp. of Massachusetts.