Latin abbreviation: Ex senatus consulto, by special decree of the Senate. On coins of the Roman Republic EX S C indicates a special mint issue authorized by the senate.
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EX. S.C. - Ex. Senatus Consulto. (By a decree of the Senate; or, by a Senatus Consultum). When these letters occur on Roman gold and silver coins, they signify, not that the Senate caused them to be struck, but the the coinage of them had the senatus consultum, or senatorial sanction when struck. The mark EX. S. C. also denotes certain disbursements made from the public treasury to defray expenses of public games. And in some instances the form was added to the title of pro-consul and of pro-praetor, when those officers, without popular election, were chosen from among the men of consular and praetorian rank, and sent EX. S. C. into the provinces.
Thus we read PR. COS. or PROCOS. EX. S. C. on coins of the Annia, Caecilia, Julia, Manlia, and Scribonia families; and in like manner PROPR. Propraetor, with the same stamp of Senatorial authority. Spanheim, vol. ii. p. 177.
EX. S. C. appears on a great many family coins; but in the imperial series the mark is observable only on those of Augustus, M. Agrippa, Claudius, Nero, Vespasian, Titus, Faustina, sen. Marciana, Hadrian, Sept. Severus, &c.
On coins of Emperors and Augustae, this mark EX. S. C. is generally found associated with the legend, or at least with the types, of Consecration, as in Claudius, Marciana, Faustina sen.