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Off the top of my head, I would point out the following: the ancient sources
that mention Britain, such as Caesar, all say that the British speak a
language related to that of the Gauls (i.e., a Celtic language rather than a
Germanic one). The writers of the time that the "Saxons" were raiding and
attacking clearly portray these "Saxons" as being a distinct people with a
distinct language. The first person ever in the history of the world to
write down an English word appears to have been our old friend Gildas, he
uses the word "keels" which he says is a foreign, "Saxon" word meaning
ships. Gildas clearly identifies himself as British, and clearly identifies
the "Saxons" as a foreign people with a very strange, foreign language.
Inscriptions from Roman Britain make it clear that the people spoke a Celtic
language, which of course had come into contact with the Latin of the
conquering Romans. From these inscriptions we see a people who have Celtic names, who worship gods with Celtic names. The oldest records of
place-names in Britain are all of Celtic names, before the coming of the
"Anglo-Saxons" who gave many places English names.
Furthermore, it is not just the "English-speaking historians" who say that
English was brought to Britain by the "Anglo-Saxons", historians all say
this no matter what their language (except your colleague Harper). Of
particular note would be the history and traditions of the people who speak Celtic languages. The Welsh have an oral tradition, that is to say stories, dating back before the coming of the "Anglo-Saxons". If English was spoken in Britain at that time, the English-speakers should have stories just as old. But the oldest stories of the English-speaking people of Britain are ll about showing up in boats and fighting with people who spoke a foreign language they call "Welsh".
Another minor, but important point: English is called "English" because it
was the language of the "Angles" and related cultures. The Celtic languages call it "Saxon". If Harper believes that English was spoken in Britain efore the coming of the "Angles" and the "Saxons", what was the name of this language--what did its own speakers call it, and what did others in Britain (such as speakers of Celtic languages) call it?