In Celtic lore, the king of the Otherworld is often identified as Arawn or Gwynn ap Nudd. He presides over the realm of the dead and is associated with themes of life after death and the supernatural. The Otherworld is depicted as a paradise separate from the mortal realm, embodying Celtic beliefs in reincarnation and the cycles of existence. Arawn's role underscores the importance of the afterlife in Celtic spirituality and myth.