The History of English in Ten Minutes
chapter 2 The Norman Conquest or excuse my English
1066 True to his name, William the Conqueror invades Britain, bringing new concepts from across the channel like the French language, the Doomsday book and the duty free Galois's multipack.
French was de rigeur for all official business, with words like 'judge', 'jury', 'evidence' and 'justice' coming in and giving John Grisham's career a kick-start. Latin was still used ad nauseam in Church, and the common man spoke English able to communicate only by speaking more slowly and loudly until the others understood him. Words like 'cow', 'sheep' and 'swine' come from the English-speaking farmers, while the a la carte versions - 'beef', 'mutton' and 'pork' come from the French-speaking toffs beginning a long running trend for restaurants having completely indecipherable menus.
All in all, the English have enrolled about 10,000 new words from the Norman. But they still couldn't draft the Lord with...
The bonhomie all ended when the English nation took their new warlike lingo of 'armies', 'navies' and 'soldiers' and began the Hundred Years War against France. It actually lasted 116 years, but by the point on one could count any higher in French and English took over as the language of power.