April 23 is the 113th day of the year (114th in leap years) in the Gregorian calendar. There are 252 days remaining until the end of the year.
1348 – The founding of the Order of the Garter by King Edward III is announced on St. George's Day.
1635 – The first public school in the United States, Boston Latin School, is founded in Boston.
1879 – Fire burns down the second main building and dome of the University of Notre Dame, which prompts the construction of the third, and current, Main Building with its golden dome.
1914 – First baseball game at Wrigley Field, then known as Weeghman Park, in Chicago.
1940 – The Rhythm Club fire at a dance hall in Natchez, Mississippi, kills 198 people.
1945- World War II: Adolf Hitler's designated successor, Hermann Göring, sends him a telegram asking permission to take leadership of the Third Reich. Martin Bormann and Joseph Goebbels advise Hitler that the telegram is treasonous.
1968 – Vietnam War: Student protesters at Columbia University in New York City take over administration buildings and shut down the university.
1985 – Coca-Cola changes its formula and releases New Coke. The response is overwhelmingly negative, and the original formula is back on the market in less than three months.
2005 – The first ever YouTube video, titled "Me at the zoo", was published by user "jawed".
2013 – At least 28 people are killed and more than 70 are injured as violence breaks out in Hawija, Iraq.
2018 -A vehicle-ramming attack kills 10 people and injures 16 in Toronto. A 25-year-old suspect, Alek Minassian is arrested.
