July 15

• July 15, 1099
  Jerusalem falls to the crusaders after a seven weeks of siege ending First Crusade and following a massacre of the city's Muslim and Jewish population with the dead numbered about 3,000
• July 15, 1410
  Lithuanian-Polish forces defeat the Teutonic Knights at the Battle of Grunwald in Prussia, thereby halting the Knights' eastward expansion along the Baltic and hastening their decline
• July 15, 1606
  The painter Rembrandt Harmenszoon van Rijn, is born in Leiden, Netherlands
• July 15, 1662
  A Royal Charter, which created the Royal Society of London with Lord Brouncker serving as the first President, is signed
• July 15, 1685
  James Scott, the Duke of Monmouth and illegitimate son of Charles II, is executed on Tower Hill in England, after his army was defeated at Sedgemoor
• July 15, 1741
  Georg Wilhelm Steller, a German botanist in Russian exploratory mission under Vitus Bering, claims to see the Alaska, American mainland and becomes a pioneer of Alaskan natural history
• July 15, 1788
  Louis XVI jails 12 deputies who protest new judicial reforms
• July 15, 1834
  Spanish Inquisition is officially abolished by a Royal Decree signed by regent Maria Christina of the Two Sicilies
• July 15, 1857
  British women and children are murdered by Indian mutineers in the second Cawnpore Massacre
• July 15, 1895
  Stefan Stambolov, ex-prime minister of Bulgaria, is murdered by Macedonian rebels
• July 15, 1918
  Second Battle of the Marne, the last major German Spring Offensive on the Western Front, begins
• July 15, 1974
  TV news anchor Chris Chubbuck shoots herself in the head with a revolver on live TV, dying 14 hours later, at age 30
• July 15, 2007
  In Tacoma, Washington, USA, the second span of the Tacoma Narrows Bridge opens to traffic, making it the longest twin suspension bridge in the world

March 6

• March 6, 1475
  Michelangelo Buonarroti, painter, sculptor and architect, is born
• March 6, 1521
  Portuguese navigator Ferdinand Magellan complete crossing the Pacific Ocean in 99 days, renames the South Sea as the Pacific Ocean, and lands at the island of Guam
• March 6, 1665
  Philosophical Transactions of Royal Society, a scientific journal published by the Royal Society of London, starts publishing
• March 6, 1714
  Peace of Rastatt is signed by French emperor and Charles VI of Habsburg to put an end to state of war between them from the War of the Spanish Succession
• March 6, 1728
  Spain and England sign Treaty of El Pardo, effectively ending end to the Anglo-Spanish War
• March 6, 1820
  The Missouri Compromise is signed by President James Monroe, providing for the admission of Missouri into the Union as a slave state, but prohibited slavery in the rest of the northern Louisiana Purchase territory
• March 6, 1836
  Battle of the Alamo ends with defeat for Texan separatists and murder of all the Alamo defenders after fighting for 13 days during the Texas Revolution in Mexico
• March 6, 1899
  German pharmaceutical company Friedrich Bayer registers Aspirin, brand name for acetylsalicylic acid, with the Imperial Patent Office in Berlin
• March 6, 1944
  United States Air Force begins daylight bombing of Berlin
• March 6, 1957
  Ghana, formerly Gold Coast, declares independence from United Kingdom, with Kwame Nkrumah as Prime Minister
• March 6, 1986
  USSR's Vega 1 flies by Halley's Comet at 8,889 km