What did druids teach about the soul after death?

The druids, who served as the learned priestly class among ancient Celtic peoples, taught that the soul was immortal. Their principal doctrine regarding the afterlife was the belief in the transmigration of souls, which held that the soul passed into another body after death.12

This teaching emphasized the continuity of existence beyond the physical end of life. While this belief in reincarnation was a core tenet of their religious instruction, Celtic traditions also featured diverse concepts of an otherworld—often envisioned as islands in the sea or an underground realm—where the deceased might dwell in a state of eternal happiness, free from sickness, old age, or death.2