On September 28, 1066, William the Conqueror invaded England from Normandy, France. After successfully conquering the country, William ushered in a series of political and legal reforms that still define the United Kingdom and its former colonies to this day, including, centralization of state power, a census, and the infusion of French and Latin into the language of the courts.
Learn more about William the Conqueror from Project Gutenberg.