Roman Foe refers to the enemies of the Roman Empire, which included the Celts, Goths, and Huns. The Celts were a group of Indo-European peoples who lived in parts of Europe and the British Isles. The Goths were a Germanic people who lived in Eastern Europe and the Balkans. The Huns were a nomadic people from Central Asia who invaded Europe in the 4th and 5th centuries. All three of these groups posed a threat to the Roman Empire and were considered its foes.