451 in History
April 7 Attila's Hun's plunder Metz
June 20 Germans and Romans beat Atiila the Hun at Catalarinische Fields
June 24 10th recorded perihelion passage of Halley's Comet
September 20 General Aetius defeats Attila the Hun at Chalons-sur-Marne
October 8 Council of Chalcedon (4th ecumenical council) opens