Why doesn't Brithenig or Bretanach exist IRL?

I was wondering the other day, why didn't the use of Latin in Britain
survive the withdrawal of the legions? Latin seems to have been in common
use in Britain throughout the Roman period, but whereas in most of Roman
Europe the use of Latin continued after the breakdown or Roman authority,
and displaced the native languages, eventually evolving into the Romance
Languages, the Britons seem to have reverted to Old Welsh and (except for
the clergy) forgotten Latin entirely. What brought this about?

Pete

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