1122: Concordat of Worms is agreed between Pope Calixtus II and Holy Roman Emperor Henry V

1821: Fall of Tripolitsa: Greek forces massacre 6,000 to 15,000 Muslim and Jewish civilians during the Greek War of Independence

1862: Otto von Bismarck is appointed Prime Minister and Foreign Minister of Prussia by King Wilhelm I

1884: American Herman Hollerith patents his mechanical tabulating machine, beginning the era of data processing

1957: President Dwight D. Eisenhower orders US troops to support the integration of nine Black students at Little Rock Central High School in Arkansas after a white mob forces them to withdraw

2018: Indian Prime Minister Narendra Modi launches “Modicare,” a free healthcare program for 500 million people, the world’s largest healthcare initiative

Source: Οnthisday.com