The pomerium (or pomoerium), from post + moerium>murum (wall), was the sacred boundary of the city of Rome. In legal terms, Rome existed only within the pomerium; everything beyond it was simply land belonging to Rome. Location and extensions Tradition maintained that it was the original line ploughed by Romulus around the walls of the original city, and that it was inaugurated by Servius Tullius. It didn't follow the line of the Servian walls, although it remained unchanged until the Dictator L… (More on Pomerium)