Religion & Belief
Archaeologists believe that the Iron Age Celts had many gods and goddesses and that the Celts worshipped their gods through sacrifice, giving them valuable objects to keep them happy.
But material treasures weren't the only sacrifices - the Iron Age Celts sacrificed (killed) animals, and even humans, to their gods.
The Celts also sacrificed weapons to the gods by throwing them into lakes, rivers and bogs - places they considered special. At Llyn Cerrig Bach, archaeologists have found over 150 objects of bronze and iron, including spears, shields and swords.
The Celts paid great respect to the human head. Roman historians say they cut off the heads of their ancestors, and even their enemies, and worshipped the skulls.
The Celtic religion was closely tied to the natural world and they worshipped gods in sacred places like lakes, rivers, cliffs and bushes. The moon, the sun and the stars were especially important - the Celts thought that there were supernatural forces in every aspect of the natural world.
The druids were very important in Iron Age society but we know very little about them. They were the Celts' priests, responsible for all sorts of religious ceremonies. They were educated and powerful members of the tribe and were well respected by the other Celts. The main centre of the druids in Britain was Anglesey.
We know a little about the druids from descriptions by Roman historians. The Romans tried to limit the powers of the druids because they were so important in Iron Age society.