A golden key "(chrusea klês)" was laid on the tongue of initiates by priests at Eleusis and was a symbol of the revelation they were obligated to keep secret. A key is among the attributes of other infernal deities such as Hecate, Anubis, and Persephone, and those who act as guardians or timekeepers, such as Janus and Aion. Aeacus "(Aiakos)", one of the three mortal kings who became judges in the afterlife, is also a "kleidouchos" (κλειδοῦχος), "holder of the keys," and a priestly doorkeeper in the court of Pluto and Persephone.