The Celtic spiritual tradition — the religion of the peoples of Iron Age Britain, Ireland, Gaul, and much of central Europe — is known through a complex mix of archaeological evidence, classical descriptions, and the medieval Irish and Welsh texts that recorded fragments of an originally oral tradition after Christianization. Its characteristic features include a permeable boundary between the natural and supernatural worlds, a reverence for the landscape and its sacred sites, a sophisticated class of ritual specialists known as Druids who served as priests, judges, poets, and keepers of collective memory, and a vision of time as cyclical and regenerative. Contemporary Druidry and Celtic paganism draw on these sources to reconstruct living spiritual practices centered on relationship with the natural world.
Rumi