 Roman tradition held that the "mundus" had been dug and sealed by Romulus as part of Rome's foundation; Plutarch compares it to pits dug by Etruscan colonists, containing soil brought from their parent city, used to dedicate the first fruits of the harvest.Warde Fowler speculates the "mundus" as Rome's first storehouse ("penus") for seed-grain, later becoming the symbolic "penus" of the Roman state.In the oldest known Roman calendar, the days of the "mundus" are marked as C(omitiales) (days when the Comitia met).