This Day in History: 0000-07-15

15 Jul – St. Vladimir Day – Vladimir Sviatoslavich the Great (958-1015) was Prince of Novgorod and spread Christianity to the Rus people in 988.
15 Jul – Jerusalem was captured by the Crusaders (1099).
15 Jul – In the First Battle of Tannenberg, Polish and allied forces destroyed a force of Teutonic knights, ending the power of the Teutonic knights in Europe, and winning the most important victory in Polish military history (1410).