Note 52 — Chapter I · ROME UNDER THE KINGS.
Reading edition
“Within the town, the buildings were not allowed to approach the ramparts, which they now ordinarily touch, and outside a space extended which it was forbidden to cultivate. To all this space, which it was not permitted to inhabit or cultivate, the Romans gave the name of Pomœrium. When, in consequence of the increase of the town, the rampart was carried farther out, this consecrated zone on each side was still preserved.” (Titus Livius, I. 44.)