Praetor was a title granted by the government of Ancient Rome to men acting in one of two official capacities: the commander of an army (in the field or, less often, before the army had been mustered); or, an elected magistratus (magistrate), assigned various duties (which varied at different periods in Rome's history). The functions of the magistracy, the praetura (praetorship), are described by the adjective: the praetoria potestas (praetorian power), the praetorium imperium (praetorian authority), and the praetorium ius (praetorian law), the legal precedents established by the praetores (praetors). Praetorium, as a substantive, denoted the location from which the praetor exercised his authority, either the headquarters of his castra, the courthouse (tribunal) of his judiciary, or the city hall of his provincial governorship.
Read more about Praetor: History of The Title, Praetura, Praetors As Judges, Outdoor Actions, Later Roman Era, Byzantine Empire, Recent Praetors