Poseidon is King and God of the Sea. He is the God of horses and ships and all that live in the deep.
Epithets of Poseidon
Aigaiôn (of the Aegean Sea)
Aspheleios (Steadfast)
Asphalios (Secures Safe Voyage)
Basileus (King)
Dômatitês (of the House)
Ennosigaios (Earth-Shaker)
Epoptês (Overseer, Watcher)
Gaieokhos (Earth-Holder)
Genethlios (of the Kin; Kindred)
Hippios (of Horses)
Hippokourios (Horse Tender)
Laoitês (of the People)
Pater (Father)
Patros (Father, Ancestral)
Pelagaios (of the Sea)
Petraios (of the Rock)
Phutalmios (Nourishing)
Phytalmios (Plant Nurturer)
Prosklystios (Who Dashes Against)
Soter (Savior)
Taureos (Bull-like)
Cult Centers
Aigaios (Of Aigai in Euboia)
Genesios (Of Genesion in Argolis)
Helikônios (Of Mt Helicon in Boiotia)
Isthmios (Of the Isthmus of Korinthos)
Onkhêsios (Of Onkhesto in Boiotia)
Samios (Of Samos in Elis & the Island)
Tainarios (Of Tainaron in Lakonia)
Temple and Festivals
Poseidion or Poseidônion (Temple of Poseidon)
Poseidônia (Festival of Poseidon)
Isthmia (Isthmian Festival)
Pharia (8 Audçnaios)
Theoxenia Aethiopia (8 Gorpiaios)
Sources
Fiercely Bright One 