Although many interesting facts can be found at Wikipedia, here are the ones that caught my attention. It is remarkable to have been standing where these events once took place.
December 16, 1431 Henry VI of England is crowned King of France
November 7, 1455 Isabelle Romée, the mother of Joan of Arc, petitions a papal delegation to overturn her daughter's conviction for heresy.
April 24, 1558 Mary I of Scotland is married to the Dauphin François
December 2, 1804 Napoléon is crowned emperor by Pope Pius VII, then crowns Joséphine himself.