Poseidon

Poseidon, in the Greek mythology the god of the sea, a son of Kronos and Rhea, and brother of Zeus, Pluto, Hera, Hestia, and Demeter; had his home in the sea depths, on the surface of which he appeared with a long beard, seated in a chariot drawn by brazen-hoofed horses with golden manes, and wielding a trident, which was the symbol of his power, exercised in production of earthquake and storms. See Pluto.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Portugal * Posen
Porteus, Beilby
Portia
Portland
Portland, Isle of
Portland Vase
Porto Rico
Portobello
Portsmouth
Portsmouth
Portugal
Poseidon
Posen
Posidonius
Positivism
Posse Comitatus
Post Restante
Potemkin
Potomac River
Potosi
Potsdam
Pott, August Friedrich