The Codex Theodosianus, a compilation of the laws of the Roman Empire, was published.

The Codex Theodosianus is a compilation of the laws of the Roman Empire under the Christian emperors since 312. A commission was established by Emperor Theodosius II and his co-emperor Valentinian III on 26 March 429 and the compilation was published by a constitution of 15 February 438. It went into force in the eastern and western parts of the empire on 1 January 439. The original text of the codex is also found in the Breviary of Alaric, promulgated on 2 February 506 by Visigoth King Alaric II.