The document discusses the locations where ancient Celtic people lived, including Greece, Northern Italy, England, and Scotland. It provides details on the Celtic arrival and settlement in each location. In Scotland, the Celts arrived in 700 BC and settled in northern Ireland and western Scotland, eventually dominating the native Picts. In Northern Italy, the Celts sacked Rome in 390 BC and battled the Romans for years before being defeated. The Celts also settled in parts of England during the Iron Age and impressed the Greeks with their appearance, being introduced to writing and chariots.