| http://www.w3.org/ns/prov#value | - These battalions were tasked with maintaining public order in the City, including crowd-control at major events such as chariot-races and gladiatorial combats, and the suppression of the popular unrest that periodically shook the City e.g. the riots caused by high grain prices in AD 19.[34] Their command was given to the praefectus urbi, a senator who acted as Rome's mayor.
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