July 17 is the 198th day of the year (199th in leap years) in the Gregorian calendar; 167 days remain until the end of the year.
180 – Twelve inhabitants of Scillium (near Kasserine, modern-day Tunisia) in North Africa are executed for being Christians. This is the earliest record of Christianity in that part of the world.
1048 – Damasus II is elected pope, and dies 23 days later.[1]
1203 – The Fourth Crusade assaults Constantinople. The Byzantine emperor Alexios III Angelos flees from his capital into exile.
1429 – Hundred Years' War: Charles VII of France is crowned the King of France in the Reims Cathedral after a successful campaign by Joan of Arc.
1453 – Battle of Castillon: The last battle of the Hundred Years' War, the French under Jean Bureau defeat the English under the Earl of Shrewsbury, who is killed in the battle in Gascony.
1717 – King George I of Great Britain sails down the River Thames with a barge of 50 musicians, where George Frideric Handel's Water Music is premiered.
1762 – Former emperor Peter III of Russia is murdered.
1771 – Bloody Falls massacre: Chipewyan chief Matonabbee, traveling as the guide to Samuel Hearne on his Arctic overland journey, massacres a group of unsuspecting Inuit.
1791 – Members of the French National Guard under the command of General Lafayette open fire on a crowd of radical Jacobins at the Champ de Mars, Paris, during the French Revolution, killing scores of people.
1794 – The 16 Carmelite Martyrs of Compiègne are executed ten days prior to the end of the French Revolution's Reign of Terror.
1821 – The Kingdom of Spain cedes the territory of Florida to the United States
1867 – Harvard School of Dental Medicine is established in Boston, Massachusetts. It is the first dental school in the U.S. that is affiliated with a university.
1901 – Liner Deutschland sets east to west transatlantic record of five days, eleven hours and five minutes.[5]
1902 – Willis Carrier creates the first air conditioner in Buffalo, New York.
1917 – King George V issues a Proclamation stating that the male line descendants of the British Royal Family will bear the surname Windsor.
1918 – Tsar Nicholas II of Russia and his immediate family and retainers are executed by Bolshevik Chekists at the Ipatiev House in Yekaterinburg, Russia.[6]
1918 – The RMS Carpathia, the ship that rescued the 705 survivors from the RMS Titanic, is sunk off Ireland by the German SM U-55; five lives are lost.
1932 – Altona Bloody Sunday: A riot between the Nazi Party paramilitary forces, the SS and SA, and the German Communist Party ensues.
1936 – Spanish Civil War: An Armed Forces rebellion against the recently elected leftist Popular Front government of Spain starts the civil war.
1938 – Douglas Corrigan takes off from Brooklyn to fly the 'wrong way' to Ireland and becomes known as 'Wrong Way' Corrigan.
1944 – Port Chicago disaster: Near the San Francisco Bay, two ships laden with ammunition for the war explode in Port Chicago, California, killing 320.
1944 – World War II: At Sainte-Foy-de-Montgommery in Normandy Field Marshal Erwin Rommel is seriously injured by allied aircraft while returning to his headquarters.[8]
1945 – World War II: The main three leaders of the Allied nations, Winston Churchill, Harry S. Truman and Joseph Stalin, meet in the German city of Potsdam to decide the future of a defeated Germany.
1953 – The largest number of United States midshipman casualties in a single event results from an aircraft crash in Florida, killing 44.
1955 – Disneyland is dedicated and opened by Walt Disney in Anaheim, California.
1962 – Nuclear weapons testing: The 'Small Boy' test shot Little Feller I becomes the last atmospheric test detonation at the Nevada National Security Site.
1968 – Abdul Rahman Arif is overthrown and the Ba'ath Party is installed as the governing power in Iraq with Ahmed Hassan al-Bakr as the new Iraqi President.
1973 – King Mohammed Zahir Shah of Afghanistan, while having surgery in Italy, is deposed by his cousin Mohammed Daoud Khan.
1979 – Nicaraguan dictator General Anastasio Somoza Debayle resigns and flees to Miami, Florida, United States.
1981 – A structural failure leads to the collapse of a walkway at the Hyatt Regency in Kansas City, Missouri, killing 114 people and injuring more than 200.
1984 – The national drinking age in the United States was changed from 18 to 21.
1989 – First flight of the B-2 Spirit Stealth Bomber.
1989 – Holy See– Poland relations are restored.
1996 – TWA Flight 800: Off the coast of Long Island, New York, a Paris-bound TWA Boeing 747 explodes, killing all 230 on board.
2014 – Malaysia Airlines Flight 17, a Boeing 777, crashes near the border of Ukraine and Russia after being shot down. All 298 people on board are killed