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The following events took place on April 20. The list is arranged in chronological order.

Found 57 events. Showing 1 - 30.

• 1303

  The Sapienza University of Rome is instituted by Pope Boniface VIII.
• 1453

  Three Genoese galleys and a Byzantine blockade runner fight their way through an Ottoman blockading fleet a few weeks before the fall of Constantinople.
• 1534

  Jacques Cartier begins his first voyage to what is today the east coast of Canada, the island of Newfoundland and Labrador.
• 1535

  The sun dog phenomenon observed over Stockholm and depicted in the famous painting Vädersolstavlan.
• 1653

  Oliver Cromwell dissolves the Rump Parliament.
• 1657

  Admiral Robert Blake destroys a Spanish silver fleet under heavy fire at the Battle of Santa Cruz de Tenerife.
• 1657

  Freedom of religion is granted to the Jews of New Amsterdam (later New York City).
• 1689

  The former king, James II of England, now deposed, lays siege to Derry.
• 1752

  Start of Konbaung–Hanthawaddy War, a new phase in the Burmese Civil War (1740–57).
• 1770

  The Georgian king, Erekle II, abandoned by his Russian ally Count Totleben, wins a victory over Ottoman forces at Aspindza.
• 1775

  American Revolutionary War: The Siege of Boston begins, following the battles at Lexington and Concord.
• 1789

  George Washington arrives at Grays Ferry, Philadelphia while en route to Manhattan for his inauguration
• 1792

  France declares war against the “King of Hungary and Bohemia”, the beginning of French Revolutionary Wars.
• 1800

  The Septinsular Republic is established.
• 1809

  Two Austrian army corps in Bavaria are defeated by a First French Empire army led by Napoleon at the Battle of Abensberg on the second day of a four-day campaign that ended in a French victory.
• 1810

  The Governor of Caracas declares independence from Spain.
• 1818

  The case of Ashford v Thornton ends, with Abraham Thornton allowed to go free rather than face a retrial for murder, after his demand for trial by battle is upheld.
• 1828

  René Caillié becomes the first non-Muslim to enter Timbuktu.
• 1836

  U.S. Congress passes an act creating the Wisconsin Territory.
• 1861

  American Civil War: Robert E. Lee resigns his commission in the United States Army in order to command the forces of the state of Virginia.
• 1862

  Louis Pasteur and Claude Bernard complete the experiment falsifying the theory of spontaneous generation.
• 1865

  Astronomer Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX’s yacht, the L'Immaculata Concezion.
• 1871

  The Civil Rights Act of 1871 becomes law.
• 1876

  The April Uprising begins. Its suppression shocks European opinion, and Bulgarian independence becomes a condition for ending the Russo-Turkish War.
• 1884

  Pope Leo XIII publishes the encyclical Humanum genus.
• 1902

  Pierre and Marie Curie refine radium chloride.
• 1908

  Opening day of competition in the New South Wales Rugby League.
• 1912

  Opening day for baseball’s Tiger Stadium in Detroit, and Fenway Park in Boston.
• 1914

  Nineteen men, women, and children die in the Ludlow Massacre during a Colorado coal-miner’s strike.
• 1916

  The Chicago Cubs play their first game at Weeghman Park (currently Wrigley Field), defeating the Cincinnati Reds 7–6 in 11 innings.

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