This is the 223rd day of the year, with almost 142 days remaining until the end of the year.
3114 BC - The Mesoamerican Long Count calendar, used by several pre-Columbian civilzations, notably the Mayans, begins.
355 AD - Claudius Silvanus, accused of treason, proclaims himself Roman Emperor against Constantius II.
1667 - Anna Maria Luisa de Medici, Florentine patroness of the arts, the last scion of the House of Medici is born.
1804 - Francis II assumes the title of first Emperor of Austria.
1898 - American troops enter the city of Mayaguez, Puerto Rico during the Spanish-American War.
1919 - The constitution of the Weimar Republic is adopted.
1929 - Babe Ruth becomes the first baseball player to hit 500 home runs in his career with a home run at League Park in Cleveland, Ohio.
1934 - The first civilian prisoners arrive at the Federal prison on Alcatraz Island.
1942 - Actress Hedy Lamarr and composer George Antheil receive a patent for a frequency hopping, spread spectrum communication system that later became the basis for modern technologies in wireless telephones and Wi-Fi.
1972 - The last United States ground combat unit departs South Vietnam.
2003 - NATO takes over command of the peacekeeping force in Afghanistan, marking its first major operation outside Europe in it 54-year history.