[aristeides]

I was aware that England was ruled by Angevin kings. I was -- and still am -- unaware that any Celtic dialect was spoken in Anjou.

[muawiyah]

Gallo is the language from which both the French dialects and the English creoles are ultimately derived.

As it turns out no Celtic language has been incorporated into either.

Gallo, as a language derives primarily from Latin.

Important Note - it is likely none of the Angevenian royalty who lived in Brittany ever bothered to learn any part of English.