Symmachus (/ˈsɪməkəs/; Greek: Σύμμαχος "ally"; fl. late 2nd century AD) was a writer who translated the Old Testament into Greek. His translation was included by Origen in his Hexapla and Tetrapla, which compared various versions of the Old Testament side by side with the Septuagint. Some fragments of Symmachus's version that survive, in what remains of the Hexapla, inspire scholars to remark on the purity and idiomatic elegance of Symmachus' Greek. He was admired by Jerome, who used his work in composing the Vulgate.