[544] Quintilian informs us, that one of the three new letters the emperor Claudius attempted to introduce, was the Aeolic digamma, which had the same force as v consonant. Priscian calls another anti-signs, and says that the character proposed was two Greek sigmas, back to back, and that it was substituted for the Greek ps. The other letter is not known, and all three soon fell into disuse. [545] Caesar by birth, not by adoption, as the preceding emperors had been, and as Nero would be, if he succeeded. [546] Tacitus informs us, that the poison was prepared by Locusta, of whom we shall hear, NERO, c. xxxiii. etc. [547] A.U.C. 806; A.D. 54.