E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
French of Stratford atte Bowe.
There is a spring which (so they say), if anyone tastes, he murders his French [Gallice barbarizat]; so that when anyone speaks that language ill, we say he speaks the French of Marlborough [Gallicum Merleburgæ].Walter Map.