Gallia Celtica was a region in ancient Gaul, primarily inhabited by the Celts. It encompassed parts of modern-day France, Belgium, and Switzerland. This area was known for its rich culture, including art, music, and tribal societies. The Celts in Gallia Celtica were organized into various tribes, each with its own customs and governance. During the Roman conquest in the 1st century BCE, Gallia Celtica became part of the expanding Roman Empire. The Romans established cities and infrastructure, integrating the region into their economy and culture. This led to significant changes in the local way of life, blending Celtic traditions with Roman influences.