Ancient Celtic religion
Since there aren't written records of their beliefs, we learn about them from what they left behind. The Celts believed in many gods and goddesses, and their religion was similar across different regions. and "a basic religious homogeneity" among the Celtic peoples. Some popular deities were Lugus, Toutatis, Taranis, Cernunnos, Epona, Maponos, Belenus, Ogmios, and Sucellos. They also believed in spirits in nature.
The priests of the Celtic religion were called druids, but we don't know much about them. The Celts held ceremonies in special places like groves and shrines. Caesar says the Gauls believed they all descended from a god of the dead and underworld. They made offerings of valuable items in water or wells. They sometimes sacrificed animals, and there are stories of human sacrifice, but it might be exaggerated.
We don't know all the festivals they celebrated, but they had four important ones during different seasons. After the Romans took over Gaul and southern Britain, the Celtic religion mixed with Roman ideas. Later, the Celts started following Christianity, and their old religion faded. However, Celtic mythology and beliefs had a lasting influence and inspired a modern religious movement called Celtic neopaganism. Therefore, all there is to study their religion from is the literature from the early Christian period, commentaries from classical Greek and Roman scholars, and archaeological evidence.
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