Within Celtic mythology Druidism played a primary role. It is the religious faith of the ancient Celts and those of the Gauls.
Druidic mythology and religion bases knowledge as the key to self awareness. This is seen through the symbolism in holy places which are of great importance and associated with wisdom, for example the Well of Wisdom believed to be situated at the centre of the world.
Druidism believed in the immortality of the soul, where the soul of one being would, when it died, pass into the body of a newborn child.
Druids would teach about the omnipresence of a spiritual otherworld, it is believed to be sometimes accessible to us as humans, however it is particularly close to us during the time of Samhain. The underworld and upperworld within the Druidic teachings held no division (unlike that of the welsh druidism.)
There were three classes to the druidic orders in celtic mythology; Prophets, bards and priests. Druids where well versed in the arts of astrology, magic, the mysterious properties of plants and animals. In regards to their close ties with nature, they reverred the Oak Tree and mistletoe.
The celtic gods, the Tuatha De Danaan are inseparable from that of the environment in which they reside. As this is the case for the gods, the Druids therefore looked upon nature with reverence. They saw it as being populated with many divine spirits, gods, goddesses.
With the four annual festivals in Celtic religion, fire played a crucial role. Fire was believed to be the spiritual force unto itself as it is not bound into a cosmology of four necessary elements. The element of fire is believed to have the magical properties of destructiveness and cleansing while bringing heat and energy.