Britania by Pliny

Opposite to this coast is the island called Britannia, so celebrated in the records of Greece(1) and of our own country. It is situate to the north-west, and, with a large tract of intervening sea, lies opposite to Germany, Gaul, and Spain, by far the greater part of Europe. Its former name was Albion; but at a later period, all the islands, of which we shall just now briefly make mention, were included under the name of “Britanniæ.” This island is distant from Gesoriacum, on the coast of the nation of the Morini, at the spot where the passage across is the shortest, fifty miles. Pytheas and Isidorus say that its circumference is  miles.