Note 136 The establishment of the Britons in Gaul is proved in the sixth century by Procopius [Bell. Goth. iv. 20], Gregory of Tours, the second council of Tours (A.D. 567), and the least suspicious of their chronicles and lives of saints. The subscription of a bishop of the Britons to the first council of Tours (A.D. 461, or rather 481), the army of Riothamus, and the loose declamation of Gildas (alii transmarinas petebant regiones, c. 25, p. 8), may countenance an emigration as early as the middle of the fifth century. Beyond that era the Britons of Armorica can be found only in romance; and I am surprised that Mr. Whitaker (Genuine History of the Britons, p. 214-221) should so faithfully transcribe the gross ignorance of Carte, whose venial errors he has so rigorously chastised.

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The History Of The Decline and Fall Of The Roman Empire—Volume 1— Chapter 38