The group known as the “Twelve Gods” possessed a δωδεκάθεον at Cos and had their own priest. But the gods' names are nowhere explicitly enumerated. They can only be recovered (1) from observation of the roster of the Twelve Gods elsewhere in Greece and (2) from conclusions as to the most important gods at Cos. The “canonical” group in Greece generally was: Aphrodite, Apollo, Ares, Artemis, Athena, Demeter, Hephaestus, Hera, Hermes, Hestia, Poseidon, Zeus. But of these twelve, Ares and Hephaestus are nowhere found at Cos on either epigraphic or literary evidence. It is therefore unlikely that they belong in the Twelve.