Roman magistracies were public offices through which government, jurisdiction and military command were exercised. In the Republic, many were elective, collegiate and limited in duration. A magistrate held an office; a senator belonged to a council. The categories overlapped, but were not identical.
Many ordinary offices lasted a year. A colleague could obstruct another holder of the same office, while plebeian tribunes had their own powers of intervention. This was not a modern separation of powers: political, judicial, religious and military functions overlapped.
Imperium denoted a particular authority associated above all with senior command and government. Consuls and praetors held it; not every public official did. A magistrate's effective powers also depended on location, assigned responsibilities and historical period.
The sequence of offices was called the cursus honorum. Laws established and altered minimum ages, intervals and the order of offices; the Lex Villia of 180 BCE and Sulla's reforms were particularly important. A single age chart should therefore not be projected across the entire Republic.
A career required resources, connections and electoral support. The absence of a regular salary did not make office equally accessible to all citizens. Family background, military reputation, advocacy and public entertainment all mattered. See elections and Roman citizenship for political participation.
A Republican dictator was appointed for a specific extraordinary task; traditionally his authority ended after six months or on completion of the assignment. The dictatorships of Sulla and Caesar were not straightforward repetitions of that early model.
A proconsul or propraetor could continue to command through an extension of authority: a promagistrate was not necessarily a consul elected for another term. A legate served as a representative or deputy; that status was not equivalent to an independent elected magistracy.
Under the emperors, older office names survived, but the ruler's authority and influence over appointments became decisive. Republican institutions should therefore be distinguished from the careers of imperial officials and commanders.
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