The Codex Hermogenianus (Eng. Hermogenian Code) is the title of a collection of constitutions (legal pronouncements) of the Roman emperors of the first tetrarchy (Diocletian, Maximian Augusti, and Constantius and Galerius Caesars), mostly from the years 293–94. Most of the work is now lost. The work became a standard reference in late antiquity, until it was superseded by the Breviary of Alaric and the Codex Justinianeus.