entity_id,source_id,evidence_type,source_note
ENT_OPHION,SRC_APOLLONIUS_ARGONAUTICA,direct attestation,"Apollonius, Argonautica 1.503-506: the primordial serpent Ophion who ruled Olympus with Eurynome."
ENT_OPHION,SRC_THEOI_GODS,index attestation,Literary attestation in classical/mythographic tradition; cult evidence varies by entity.
ENT_OPHION,SRC_THEOI_HOME,index attestation,"Attested in Theoi Project index (Greek gods, spirits, heroes in classical literature)."