This Day That Year

September 20

in History

Imperial Border Negotiations — An empress and a king settle their frontier
Burgenland, Austria/HungaryMedieval
1058

Imperial Border Negotiations

An empress and a king settle their frontier

Agnes of Poitou, regent of the Holy Roman Empire during her son Henry IV's minority, met with Andrew I of Hungary to negotiate the disputed border territory of Burgenland. The diplomatic encounter reflected the complex web of alliances and territorial claims that defined politics in the eleventh-century Holy Roman Empire.

1058 AD
Dorothy Vaughan Was Born — The hidden figure who computed America's future
Kansas City, Missouri, USAEarly 20th Century
1910

Dorothy Vaughan Was Born

The hidden figure who computed America's future

Dorothy Vaughan was born in Kansas City, Missouri. She became one of the most important yet long-overlooked figures in American space history. As the first African-American woman to supervise a group at NASA's Langley Research Center, she led calculations that helped send Americans into space. Her story, told in Hidden Figures, inspired millions.

1910 AD
Irish War of Independence — Irish War of Independence: British police known as "Black and Tans" burn the town of Balbriggan and kill two local men.
Early 20th Century
1920

Irish War of Independence

Irish War of Independence: British police known as "Black and Tans" burn the town of Balbriggan and kill two local men.

Irish War of Independence: British police known as "Black and Tans" burn the town of Balbriggan and kill two local men in revenge for an IRA assassination.

1920 AD