As to the payment of teachers, it is clear that before Vespasian it was very unequal. Verrius Flaccus, who was tutor to the children of Augustus, received a salary of 100,000 sesterces (£1,000).[687] Even the infamous Palaemon, to whom parents were forbidden to send their children by Tiberius and Claudius, got as much as 40,000 sesterces. Martial takes a pessimistic view. In his advice to a friend on a career for his son he counsels: Let him avoid grammarians and rhetoricians if he wants to make money: Artes discere vult pecuniosas? fac, discat, citharoedus aut choraules.[688] In Gaul, it appears, teachers were paid by the State before this was the case at Rome; for Strabo remarks in the first century A.D. that he found State-appointed teachers there.[689] But there must have been great lack of organization and equality because State-payment meant, at that time, payment by the municipal town, which could not always provide proper security. Security, indeed, became more and more shaken, and the improvement made by Vespasian when he fixed the teachers’ salaries was a much-needed measure. In the famous decree of 376 Gratian and Valentinian ratified this enactment.[690] Rhetoricians are to receive twenty-four _annonae_[691] from the treasury, Greek and Latin grammarians, twelve. The chief cities of the provinces are encouraged to elect professors who are to be paid according to the standard fixed by the emperors. Trèves, the imperial favourite, gets something more (_uberius aliquid_), thirty annonae for a rhetor and twenty for a grammarian. There can be no doubt that the emperors tried to monopolize education. Julian’s decree[692] that the appointment of all teachers was to be subject to the imperial approval, and the law of Theodosius and Valentinian in the next century forbidding all public schools outside the imperial academy, are illustrations of this tendency. Nevertheless, there must have been a large number of private-school teachers who were not paid by the State. The imperial legislation of the later empire could not have done away entirely with so established and widespread a class of men. They survived, especially in elementary education, and possibly their number exceeded that of the officially State-paid teachers.