 The name Foz comes from the Latin word "faux" which graphically describes the river mouth of the Masma river; Foz is the Galician term for base level.The foundation of Foz dates back to pre-Roman times, as attested by the existing forts Fazouro and Pena do Altar.Its foundation may originate in the time of the Ártabros or, according to the historian Amor Meilán, a factory may have been established by the Tartessos.