The Cult
Plūtō's Roman cult was marked by what it avoided rather than by what it displayed. The mundus, a subterranean ritual pit, was opened only three times a year—August 24, October 5, and November 8—and on those days public business was suspended because the dead were abroad. The Ludi Saeculares of 17 BCE included nocturnal offerings to the inferis recorded on the Severan copy of the Augustan acta. Black victims were preferred, and rites were conducted at night or in roofed spaces. The 1888 discovery on the Quirinal of a subterranean altar-chamber identified with the Tarentum gave archaeology its one tangible trace of this deliberately hidden cult.


