Romano-British citizens who no longer had the protection of the Roman Empire were so terrified of the raiding Saxons, Angles, Picts and others that they buried their most valuable belongings. According to an entry from 418 in the 9th-century text Anglo-Saxon Chronicle, "In this year the Romans collected all the treasures which were in Britain and hid some in the earth so that no one afterwards could find them, and some they took with them into Gaul." ... Because no organic materials survived in the Hoxne hoard, radiocarbon can't be used as a dating technique. Instead, archaeologists use the age...