POMERIUM, is derived from post and marium (murus), and thus signifies a line running by the walls of a town. The pomarium consisted of a symbolical not of an actual wall, and the course of it was marked by stone pillars. The custom of making a pomarium was peculiar to the Latins and the Etruscans. It was done as follows:— "After this," says Plutarch, "the founder, yoking a bull and a cow together, ploughed a deep furrow with a brazen ploughshare round the bounds. The attendants took care that all the clods fell inwards,—that is, towards the city." This sacred line might be built beyond, but it was necessary to leave a certain space on each side of it unoccupied, so as not to unhallow it by profane use.