Hmmmm........not quite. There was a
big difference between Normandy and Aquitaine!
I am Norman, not French!
As for the French
in the Order of Garter....English still didn't exist as a coherent language in 1066. In fact it didn't really become cohesive for another 300 years when Chaucer started "The Canterbury Tales" sometime in the 1380s. Even then English wasn't spoken all over England as evidenced by "Sir Gavin & the Green Knight", written at about the same time in the north of England, and almost in pure German.
AFAIK English is the youngest language on the planet.