April
- William Harvey born, 1578.
Persecution of Jews in Nazi Germany begins, 1933. - Charlemagne, Charles the Great, born, 742.
- Peace of Cateau-Cambresis ending Habsburg-Valois Wars, 1559.
Arab armistice with Israel, 1949. - North Atlantic Treaty (NATO) signed at Washington, 1949.
- Thomas Hobbes born, 1588.
Joseph Lister born, 1827. - U.S. enters World War I, 1917.
- St. Francis Xavier born, 1506.
Capetown founded, 1652.
William Wordsworth born, 1770. - Petrarch crowned Poet on the Capital, Rome, 1341.
Entente Cordiale signed by England and France, 1904. - Francois Rabelais dies, 1553.
Vladimir Ilyich Lenin born, 1870. - Chartists present Petition to Parliament, 1848.
Archduke Maximilian made Emperor of Mexico, 1864. - Peace of Utrect ending War of Spanish Succession, 1713.
Napoleon Bonaparte abdicated and Treaty of Fontainebleau signed, 1814. - Firing on Fort Sumter beginning U.S. Civil War, 1861.
Yuri Alekseyevich Gagarin is first man in space, 1961. - Edict of Nantes promulgated, 1598.
First performance of Handel's Messiah at Dublin, 1742. - S.S. Titanic sank, 1912.
- Abraham Lincoln died, 1865.
- Battle of Culloden, 1746.
Harriet Quimby first woman to fly over English Channel, 1912. - Martin Luther excommunicated by Diet of Worms, 1521.
Treaty of Shimonoseki ending Sino-Japanese War, 1895. - San Francisco earthquake and fire, 1906.
- Battle of Lexington, 1775.
- Jacques Cartier reaches Labrador, 1534.
Adolf Hitler born, 1889. - Peter Abelard died, 1142.
Queen Elizabeth II born, 1926. - Queen Isabella of Spain born, 1451.
Mme. DuBarry becomes official mistress of Louis XV, 1769. - William Shakespeare died, 1616.
Cervantes died, 1616. - Library of Congress founded, 1800.
Beginning of Irish Easter Rebellion, 1916. - St. Louis (King Louis IX) born, 1214.
- Jean Racine dies, 1699.
Guernica, Spain, destroyed by German aircraft, 1937. - Edward Gibbon born, 1737.
- Mutiny on the Bounty, 1789.
League of Nations founded, 1919. - Jeanne of Arc inspires French troops to victory at Orleans, 1429.
Duke of Wellington born, 1769. - USA purchased Louisiana from France, 1803.
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