Numa built the "Ianus geminus" (also "Janus Bifrons", "Janus Quirinus" or "Portae Belli"), a passage ritually opened at times of war, and shut again when Roman arms rested. It formed a walled enclosure with gates at each end, situated between the old Roman Forum and that of Julius Caesar, which had been consecrated by Numa Pompilius himself. About the exact location and aspect of the temple there has been much debate among scholars. In wartime the gates of the Janus were opened, and in its interior sacrifices and "vaticinia" were held, to forecast the outcome of military deeds. The doors were closed only during peacetime, an extremely rare event. The function of the Ianus Geminus was supposed to be a sort of good omen: in time of peace it was said to close the wars within or to keep peace inside; in times of war it was said to be open to allow the return of the people on duty.