Hades three-headed guard dog Cerberus. The Etruscan god Aita and the Roman gods Dis Pater and Orcus were eventually taken as equivalent to Hades and merged into Pluto, a Latinization of Plouton (", Ploútōn"), itself a euphemistic title often given to Hades. The origin of Hades' name is uncertain, but has generally been seen as meaning "the unseen one" since antiquity. An extensive section of Plato's dialogue "Cratylus" is devoted to the etymology of the god's name, in which Socrates is arguing for a folk etymology not from "unseen" but from "his knowledge ("eidenai") of all noble things". Modern linguists have
Tomb of Orcus belonged to the Murina family, an offshoot of the Etruscan Spurinnae. The foundation is inscribed with the following enigmatic phrase: Orcus I was built between 470 and 450 BC (perhaps by a man named Leive; see below); a separate hypogeum, Orcus II, was built c. 325 BC. At some point in antiquity the wall between the two was removed, creating a large tomb with two dromes (entrances). The tomb was excavated in 1868 by an officer of the French Army. Upon its discovery, the excavator mistook the painting of a cyclops for the Roman god Orcus (see below), hence the