Romulus, having buried his brother Remus, together with his two foster- fathers, on the mount Remonia, set to building his city; and sent for men out of Tuscany, who directed him by sacred usages and written rules in all the ceremonies to be observed, as in a religious rite. First, they dug a round trench about that which is now the Comitium, or Court of Assembly, and into it solemnly threw the first-fruits of all things either good by custom or necessary by nature; lastly, every man taking a small piece of earth of the country from whence he came, they all threw them in promiscuously together. This trench they call, as they do the heavens, Mundus; making which their center, they described the city in a circle round it. Then the founder fitted to a plow a brazen plowshare, and, yoking together a bull and a cow, drove himself a deep line or furrow round the bounds; while the business of those that followed after was to see that whatever earth was thrown up should be turned all inwards towards the city, and not to let any clod lie outside. With this line they described the wall, and called it, by a contraction, Pomoerium, that is, post murum, after or beside the wall; and where they designed to make a gate, there they took out the share, carried the plow over, and left a space; for which reason they consider the whole wall as holy, except where the gates are; for had they adjudged them also sacred, they could not, without offense to religion, have given free ingress and egress for the necessaries of human life, some of which are in themselves unclean.