23 April Events

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. This date is slightly more likely to fall on a Monday, Thursday or Saturday (58 in 400 years each) than on Tuesday or Wednesday (57), and slightly less likely to occur on a Friday or Sunday (56).

Events

215 BC – A temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at Lake Trasimene.
599 – Maya king Uneh Chan of Calakmul attacks rival city-state Palenque in southern Mexico, defeating queen Yohl Ik'nal and sacking the city.
711 – Dagobert III is crowned King of the Franks.
1014 – Battle of Clontarf: High King of Ireland Brian Boru defeats Viking invaders, but is killed in battle.
1016 – Edmund Ironside succeeds his father Æthelred the Unready as king of England.
1343 – St. George's Night Uprising commences in the Duchy of Estonia.
1348 – The founding of the Order of the Garter by King Edward III is announced on St. George's Day.
1516 – The Bayerische Reinheitsgebot (regarding the ingredients of beer) is signed in Ingolstadt.
1521 – Battle of Villalar: King Charles I of Spain defeats the Comuneros.
1635 – The first public school in the United States, Boston Latin School, is founded in Boston.
1655 – The Siege of Santo Domingo begins during the Anglo-Spanish War, and fails seven days later.
1660 – Treaty of Oliva is established between Sweden and Poland.
1661 – King Charles II of England, Scotland and Ireland is crowned in Westminster Abbey.
1815 – The Second Serbian Uprising: A second phase of the national revolution of the Serbs against the Ottoman Empire, erupts shortly after the annexation of the country to the Ottoman Empire.
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.
1918 – World War I: The British Royal Navy makes a raid in an attempt to neutralise the Belgian port of Bruges-Zeebrugge.
1920 – The Grand National Assembly of Turkey (TBMM) is founded in Ankara. The assembly denounces the government of Sultan Mehmed VI and announces the preparation of a temporary constitution.
1927 – Cardiff City defeat Arsenal in the FA Cup Final, the only time it has been won by a team not based in England.
1935 – The Polish Constitution of 1935 is adopted.
1940 – The Rhythm Club fire at a dance hall in Natchez, Mississippi, kills 198 people.
1941 – World War II: The Greek government and King George II evacuate Athens before the invading Wehrmacht.
1942 – World War II: Baedeker Blitz – German bombers hit Exeter, Bath and York in retaliation for the British raid on Lübeck.
1945 – World War II: Adolf Hitler's designated successor Hermann Göring sends him a telegram asking permission to take leadership of the Third Reich, which causes Hitler to replace him with Joseph Goebbels and Karl Dönitz.
1946 – Manuel Roxas is elected the last President of the Commonwealth of the Philippines.
1949 – Chinese Civil War: Establishment of the People's Liberation Army Navy.
1951 – American journalist William N. Oatis is arrested for espionage by the Communist government of Czechoslovakia.
1955 – The Canadian Labour Congress is formed by the merger of the Trades and Labour Congress of Canada and the Canadian Congress of Labour.
1961 – Algiers putsch by French generals.
1967 – Soviet space program: Soyuz 1 (Russian: Союз 1, Union 1) a manned spaceflight carrying cosmonaut Colonel Vladimir Komarov is launched into orbit.
1968 – Vietnam War: Student protesters at Columbia University in New York City take over administration buildings and shut down the university.
1971 – Bangladesh Liberation War: The Pakistan Army and Razakars massacre approximately 3,000 Hindu emigrants in the Jathibhanga area of East Pakistan (now Bangladesh).
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.
1990 – Namibia becomes the 160th member of the United Nations and the 50th member of the Commonwealth of Nations.
1993 – Eritreans vote overwhelmingly for independence from Ethiopia in a United Nations-monitored referendum.
1993 – Sri Lankan politician Lalith Athulathmudali is assassinated while addressing a gathering, approximately four weeks ahead of the Provincial Council elections for the Western Province.
2005 – The first ever YouTube video, titled "Me at the zoo", was published by user "jawed".[1]
2013 – At least 28 people are killed and more than 70 are injured as violence breaks out in Hawija, Iraq.

Holidays and observances

Christian feast day:
Adalbert of Prague
George
Gerard of Toul
Toyohiko Kagawa (Episcopal and Lutheran Church)
April 23 (Eastern Orthodox liturgics)
Earliest day on which the first day of Children's Day can fall, while April 29 is the latest; celebrated on the last Saturday of April. (Colombia)
Castile and León Day (Castile and León, Spain)
Independence Day (Conch Republic, Key West, Florida)
International Pixel-Stained Technopeasant Day
Khongjom Day (Manipur, India)
National Sovereignty and Children's Day (Turkey and Northern Cyprus)
Navy Day (China)
St George's Day (England) and its related observances:
Canada Book Day (Canada)
La Diada de Sant Jordi (Catalonia, Spain)
World Book Day
UN English Language Day (United Nations)

Source: wikipedia