The Codex Theodosianus (Theodosian Code) was a legal compilation issued by the emperor Theodosius II (r. 402–450 CE) in 437 CE and valid in both halves of the empire. It started as a project in 429 CE (Cod. Theod. 1.1.5), intended initially to gather imperial legislation from the reign of Constantine onward into an authoritative collection, after the ma…