This arrangement continued (except for the year 45 B.C., when no quaestors were chosen) until 28 B.C., when Augustus transferred the aerarium to two praefecti aerarii, chosen annually by the senate from ex-praetors; in 23 these were replaced by two praetors (praetores aerarii or ad aerarium), selected by lot during their term of office; Claudius in A.D.
44 restored the quaestors, but nominated by the emperor for three years, for whom Nero in 56 substituted two ex-praetors, under the same conditions.
The origin of the quaestorship is obscure, but it was probably instituted simultaneously with the consulship in 509 B.C. 1 The number of the quaestors was originally two, but this was successively increased to four (in 421 B.C.), eight (in 267 or 241 B.C.), and by Sulla (in 81 B.C.) to twenty.
The original quaestors were afterwards distinguished by the title of urban quaestors (quaestores urbani).
Originally the quaestors seem to have been nominated by the consuls, but later, perhaps from the fall of the decemvirs (449 B.C.), they were elected by the people assembled in tribes (comitia tributa) under the presidency of a consul or another of the higher magistrates.
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