- 180 6 inhabitants of Scillium in North Africa are executed for being Christians. Earliest record of Christianity in that part of the world.
- 1203 Siege of Constantinople begins during the fourth Crusade, Crusaders aboad a Venetian fleet attack the city
- 1762 Catherine II becomes tsarina of Russia upon the murder of Peter III
- 1936 Spanish generals Francisco Franco and Emilio Mola lead a right-wing uprising, starting the Spanish Civil War
- 1945 Potsdam Conference (Truman, Stalin, Churchill) holds 1st meeting
George Frideric Handel's "Water Music" premieres on the river Thames in London
On July 17, 1717