Noun
pomerium (plural pomeria)
(historical, Ancient Rome) The tract of land denoting the formal, sacral ambit of a Roman city.
In these situations, Augustus would have power as part of his tribunician authority but his constitutional imperium within the Pomerium would be less than that of a serving consul. Source: Internet
During times of emergency, however, the Roman Republic might choose a dictator to lead for a limited time period, who was the only magistrate to be granted capital punishment authority within the Pomerium. Source: Internet
Fasces carried within the Pomerium —the boundary of the sacred inner city of Rome—had their axe blades removed; within the city, the power of life and death rested with the people through their assemblies. Source: Internet