Crusaders from the Fourth Crusade broke through Constantinople’s walls and entered the great city.
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UK Prime Minister Boris Johnson apologized for hosting a party during the height of COVID-19 lockdowns.
Shapur I became co-emperor of the Sasanian Empire with his father Ardashir I.
The 'Twentieth Century Dinosaurs' exhibit opened at the Smithsonian Institution Museum of Natural History.
Hillary Clinton announced her candidacy for US President.
Jonas Salk's Polio vaccine tested by Jonas Salk was given final approval by the US Food and Drug Administration.
