A promagistrate is a person who acts in and with the authority and capacity of a magistrate, but without holding a magisterial office. A legal innovation of the Roman Republic, the promagistracy was invented in order to provide Rome with governors of overseas territories instead of having to elect more magistrates each year. Promagistrates were appointed by senatus consultum; like all acts of the Roman Senate, these appointments were not entirely legal and could be overruled by the Roman assemblies, e.g., the replacement of Quintus Caecilius Metellus Numidicus by Gaius Marius during the Jugurthine War.