The march of time

If we leave the EU on 29 March, with which historic events will that date be shared?
845 A Norse fleet sailing up the Seine reached Paris, sacking the city and extracting a ransom from Charles the Bald.
1461 The Battle of Towton, just south of Tadcaster, one of the bloodiest battles fought on English soil, with more than 20,000 men estimated to have been killed.