https://www.reddit.com/r/AskHistorians/comments/5nqrji/when_and_why_did_the_switch_from_west_francia_to/dcdrqxl/?st=ixx7mr9u&sh=e4c0cd37"
https://www.reddit.com/r/AskHistorians/comments/5nqrji/when_and_why_did_the_switch_from_west_francia_to/dcdrqxl/?st=ixx7mr9u&sh=e4c0cd37"