A name given by the Romans to the space, originally
along the city wall within and without, which was left vacant and reckoned holy. This space
was marked off by stones, and in respect to the auspices formed the limit between city and
country. (See Livy, i. 44, and Cicero, Nat. D.
ii. 11, with the note of J. B.
Mayor.) The form Pomerium
is now generally approved (Mommsen in
, x. 40), though the other spelling is more harmonious with the etymology
of the word (post-moerium
The old Pomerium remained unchanged until the time of Sulla ; after him it was again
extended by Claudius, Nero, Vespasian, and Titus, and probably also by Augustus, Trajan, and
Aurelian. An extension of the Pomerium was only admissible on the ground of an extension of
the legal boundaries of the Empire (Tac. Ann. xii.
). See Templum