a Roman jurist, wrote under the united reign of Septimius Severus, and his son Antoninus Caracalla (Dig. 48. tit. 19. s. 39); and he survived Severus, who died A. D. 212, for he speaks of " Imperator noster cum Divo Severo patre suo" (Dig. 27. tit. 1. s. 44). There is extant a rescript Antoninus (A. D. 213) addressed to Claudius Tryphoninus, which declares that a legacy left by Cornelia Salvia to the " universitas" of the Jews in Antioch could not be sued for (Cod. 1. tit. 9. s. 1). It is probable that this rescript was addressed to Tryphoninus in the capacity of Advocatus Fisci. Tryphoninus (Dig. 23. tit. 3. s. 78.4) speaks of giving his opinion in the " auditorium," which may be that of Papinian. Tryphoninus appears to have studied Cicero's writings : he quotes the oration Pro Cluentio (Dig. 48. tit. 19. s. 39). Tryphoninus was in the Consilium of Severus at the same time with Messius and Papinian (Dig. 49. tit. 14. s. 50). He was the author of twenty-one Libri Disputationum, from which there are seventy-nine excerpts in the Digest; and he also wrote notes on Cervidius Scaevola.