one of the leading nobles in Parthia, dissatisfied with the reigning monarch, Artabanus III. (Arsaces XIX.), sent an embassy to Rome in A. D. 35, in conjunction with the eunuch Abdus, praying Tiberius to send to Parthia one of the sons of Phraates IV. to become their king. Sinnaces subsequently took an active part in the wars against Artabanus. (Tac. Ann. 6.31, 32, 36, 37.) [ARSACES XIX.]