From Latin Britannia, but compare Prydyn "Picts" which may be the genuine reflex of early Britannic *Priteni.
In medieval texts, the term often refers to the northernmost part of the island, beyond the Forth and Clyde. Where the island as a whole is meant, the phrase Ynys Prydain (Latin insula Britanniae, "Isle of Britain") is commonly used.
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