Lapis manalis
Roman sacred stones

A lapis manalis was either of two sacred stones used in the Roman religion. Although they had the same name, they were distinct stones: one the cover to the gate of the underworld and the other a rainmaking stone.
Gate to the underworld
One lapis manalis covered the mundus Cereris, a pit thought to contain an entrance to the underworld. The grammarian Festus called it ostium Orci, "the gate of Orcus". Most cities of Latium and Etruria contained a similar pit or ditch; Plutarch describes the custom of a mundus as being of Etruscan origin, and states that it was used as a place where first-fruits were deposited. The Latin word mundus meant "world". Festus, quoting Cato this time, explains that:
Mundo nomen impositum est ab eo mundo qui supra nos est.
(The mundus gets its name from that world which is above us.)
The Roman mundus was located in the Comitium. This stone was ceremonially opened three times a year, during which spirits of the blessed dead (the Manes) were able to commune with the living. The three days upon which the mundus was opened were August 24, October 5, and November 8.
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