April 11

• April 11, 1034
  Romanos III Argyros, a Byzantine emperor, is drowned in a bath on his wife's orders
• April 11, 1241
  The army of Mongol leader Batu Khan beat forces of the Kingdom of Hungary at the Battle of Mohi, a part of Mongol invasion of Europe
• April 11, 1471
  King Edward IV of England captures London from Henry VI in the War of the Roses
• April 11, 1512
  The forces of the Holy League are heavily defeated by the French at the Battle of Ravenna, while Gaston de Foix, French pretender to Navarre throne, dies in battle
• April 11, 1689
  William III and Mary II swear that they would obey the laws of Parliament and are crowned as joint rulers of Britain
• April 11, 1713
  War of the Spanish Succession and French hegemony in Europe ends with Treaty of Utrecht, which cedes France Maritime provinces and the Spanish 2.5-square mile Gibraltar in perpetuity to Britain, and Kingdom of Naples to Austria
• April 11, 1741
  A Russian commission find regent Count Ernst Johann von Biron guilty of treason and sentenced him to death by quartering, but commute the sentence to banishment for life in Siberia
• April 11, 1783
  After receiving a copy of the provisional treaty on 13 March, Congress proclaimed a formal end to hostilities with Great Britain
• April 11, 1814
  Napoleon Bonaparte, emperor of France, abdicates the throne, and, by the Treaty of Fontainebleau, is banished to the Mediterranean island of Elba with a pension from the French government
• April 11, 1848
  Hungary approve package of low, known as April Laws, making Kingdom of Hungary into a nation state
• April 11, 1899
  The Treaty of Paris ending the Spanish-American War is declared in effect
• April 11, 1909
  Tel Aviv is founded by the Jewish community on the outskirts of the ancient port city of Jaffa
• April 11, 1917
  Marcel Duchamp, a French American painter and sculptor, submits for the exhibition of the Society of Independent Artists his famous work Fountain, a simple porcelain urinal signed "R.Mutt"
• April 11, 1971
  Sheikh Mujibur Rahman, a preeminent Bengali nationalist leader of Bangladesh, becomes the first President of Bangladesh
• April 11, 1976
  Steve Jobs finishes his first significant invention, Apple I
• April 11, 1979
  Tanzanian troops take Kampala, the capital of Uganda and exile Idi Amin from Uganda
• April 11, 1986
  Halley's Comet makes closest approach to Earth this trip, 63 million km