Celts are a mix of different peoples and cultures who settled in a large area of Europe between the Iberian Peninsula and Britannia. They had an homogeneous religion, but always were politically divided. The better known ethnic group is the Gauls. Fierce and hard-fighting, in 386 B.C. the Senones Gauls led by Brennus put Rome under siege and occupied it. They were later subjugated by the Romans.