Caledonia, the ancient Roman name for Scotland. The Caledonians (later called Picts), who lived in the Scottish Highlands, were a barbarian people who fiercely resisted Roman invasion. Although defeated in 84 A.D., the Caledonians were so feared that two lines of fortifications—Hadrian's Wall, 122–27, and the Wall of Antoninus, 140–42—were built to protect Roman Britain from them.
Caesar, a title that came from the name of a Roman family. The first important member of the family was the soldier and statesman Gaius Julius Caesar.
Rome and the Roman Empire, the most powerful state of the ancient world. It grew from an Italian village to a city-state and into an organization that ruled the shores of the Mediterranean and much of western Europe.