Aerarium, derived from aes, denotes ‘treasury’. The main aerarium of Rome was the aerarium Saturni, so called from the temple below the Capitol, in which it was placed. Here were kept state documents, both financial and non-financial (including leges (see lex (1)) and *senatus consulta which were not valid until lodged there), and the state treasure, originally mainly of bronze (aes) but including also ingots of gold and silver and other valuables. The *tabularium (1) was built near it in 78 bce.The aerarium was controlled by the quaestors under the supervision of the senate, with a subordinate staff of scribae, *viatores, etc. The *tribuni aerarii, men of a property-class a little below the knights, were probably concerned with making payments from the tribes into the treasury. The aerarium sanctius was a special reserve, fed by the 5 per cent tax on emancipations. Treasure was withdrawn from it in 209 bce and on other occasions.