The spirits were assigned to one of these three kingdoms: Elysium for the blessed, Tartarus for the condemned, and Hades for the rest. In addition, they believed in the reincarnation and transmigration of souls. The dead entered the underworld crossing the Acheron River in a boat driven by Charon, the one in charge of guiding the wandering shadows of the deceased. The other shore was guarded by Cerberus, the three-headed guard dog who guarded the entrance gate to Hades and made sure that the spirits of the dead could enter and that no one should leave.
