Théodose II ( 408 - 450 )

    The Theodosian Code was composed between AD 429 and 438. In 429 the Emperor Theodosius ordered for the nine men commission to compose all imperial constitutions since the time of Constantine. Together with the Codex Hermogenianus and Codex Gregorianus this collection had to be an actual law book and a model for the education of jurists. The collection of the using constitutions had to be completed with answers (responsa) and juridical treatises. Thus it would put together leges and ius vetus. Nothing is known about the result of this commission's work. The new commission of sixteen men with the quaestor of sacred palace Antiochus was made in 435. After two years’ working the commission made sixteen books of laws. Not all of them were left to us in the complete volume. Most part of the first six books is lost.
    Codex Theodosianus received an official status together with the Codex Hermogenianus and Codex Gregorianus which before had only the character of the private collections. The Codex was enforced on 15 February 438 in the East Roman Empire and 1 January 439 in the West Empire. There are 2529 imperial issues from Constantine to Theodosius II in it. The earliest constitution in the Codex is CTh., 13, 10, 2 of 1 June 311 and the latest is CTh., 6, 23, 4 of 16 March 437



See the entries  Constitutiones  and Codex Theodosianus  in Smith's Dictionary.

Textes pour l'histoire de l'Antiquité tardive : Liens « théodosiens ».

The Latin Library : Imperatoris Theodosiani Codex.

PôLiB / Pierre Jaillette : Gothofredus edition.

Project Volterra : Codex Theodosianus.

Wikipedia : Codex Theodosianus.