The Mons Sacer, Sacer Mons, or Sacred Mount is a hill in Rome, famed as the location of the first secession of the plebs, in 494 BC.
Pierre-Nicolas Brisset, View of the Ponte Nomentano (1837). The Mons Sacer rises behind a bridge crossing the Anio along the route of the Via Ficulensis, later the Via Nomentana.