Dorotheus (Greek: Δωρόθεος) was a professor of Roman law in the law school of Berytus in Phoenicia. While his date of birth is unknown, he must at least have died before 542.[1] He was one of the three commissioners appointed by the Eastern Roman emperor Justinian I to draw up a book of Institutes,[2] after the model of the Institutes of Gaius, which should serve as an introduction to the Digest (or Pandects) already completed and promulgated on 16 December 533. His colleagues in this project were Tribonian and Theophilus; and their work was accomplished in 533 and they were all granted with the highest title quaestor sacri palatii illustris.