The Annals and the Histories · Ann. 6.12

A motion was next brought forward in the Senate by Quintilianus, a tribune of the people, respecting an alleged book of the Sibyl. Caninius Gallus, a book of the College of the Fifteen, had asked that it might be received among the other volumes of the same prophetess by a decree on the subject. This having been carried by a division, the emperor sent a letter in which he gently censured the tribune, as ignorant of ancient usage because of his youth. Gallus he scolded for having introduced the matter in a thin Senate, notwithstanding his long experience in the science of religious ceremonies, without taking the opinion of the College or having the verses read and criticised, as was usual, by its presidents, though their authenticity was very doubtful. He also reminded him that, as many spurious productions were current under a celebrated name, Augustus had prescribed a day within which…

Cornelius Tacitus · trans. Church & Brodribb, 1876
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