On the Antiquities of Prussia

...or because they surpassed even the natives themselves in the multitude of their own people and the vast and spacious occupation of the coast. For the boundaries of lands often acquire their names according to the whim of the more powerful. And that name lasts today, such that these Borussii, who are of the Germans and dwell either by the Vistula or in that tract of the sea, are called Borussians, although they have nothing in common with them except for the sky, and they would more justly be called Borussisenses. The Borussii, inhabiting this land that is fertile in every respect far and wide, nonetheless cultivated it very little, either out of ignorance of agriculture, or lest the goodness of the soil be discovered and they themselves become subject to the fear of their neighbors and be eliminated from there; or because they did not yet know how to obtain sustenance from the produce of the earth. For they fed on wild animal flesh—indeed, raw—and milk as drink, sometimes also mixed with horse blood, and that to the point of drunkenness. They did not build houses, but shielded themselves and their infants from rain and cold with caves and tree bark, for which reason it is also found to be called Subaria. For a time they had no sacred rites, eventually being led into such madness that they religiously worshipped snakes, wild beasts, and trees, as we shall say in what follows. They knew no laws, no magistrates; each was allowed as much as he dared. Their life did not differ at all from the beasts. Yet, toward the shipwrecked or those cast about by sea storms, they were more humane, and they were a help to them in every way; in all other things, there was a wondrous filth and squalid poverty. For they had neither weapons nor iron...