Germanic Invasions: The German peoples surround the north borders of the Roman Empire, while the Huns are destroying everything in their path--villages, cities, even empires.
A law of Valentinian I and Valens bans marriages between Romans and barbarians under penalty of death.
An edict issued by Valentinian I and Valens bans the importation of wine and olive oil from areas controlled by the barbarians.[1]
Imperatores Valentinianus, Valens, Gratianus . Ad barbaricum transferendi vini et olei et liquaminis nullam quisquam habeat facultatem ne gustus quidem causa aut usus commerciorum. * VALENTIN. VALENS ET GRAT. AAA. AD THEODOTUM MAG. MIL.