Some Suggested Subject Headings when searching in the WSU Online Catalog or looking for journal articles:
Gods, Greek
Gods, Roman
Mythology, Classical
Mythology, Greek
Mythology, Roman
The name of a particular god (ex. Zeus)
Other terms to pair with Greek, Greece, Roman, or Rome in a keyword search:
diety or dieties
legend or legends
god or gods
oracle or oracles
divination
religion
cult
shrine or shrines
temple or temples