Codex Hermogenianus

[2] Nevertheless, from the surviving references and excerpts it is clear that it was a single book work, subdivided into thematic headings (tituli) containing largely rescripts to private petitioners,[3] organised chronologically.

[11] Most famously, the Gregorian and Hermogenian Codes are cited as a model for the organisation of imperial constitutions since Constantine I in the directive ordering their collection in what was to become the Codex Theodosianus, addressed to the senate of Constantinople on 26 March 429, and drafted by Theodosius II's quaestor Antiochus Chuzon.

[12] In the post-Theodosian era both Codes are quoted as sources of imperial constitutions by the mid-fifth-century anonymous author of the Consultatio veteris cuiusdam iurisconsulti (probably based in Gaul);[13] are cited in marginal cross-references by a user of the Fragmenta Vaticana;[14] and in notes from an eastern law school lecture course on Ulpian's Ad Sabinum.

[16] In the west, some time before AD 506, both codices were supplemented by a set of clarificatory notes (interpretationes), which accompany their abridged versions in the Breviary of Alaric,[17] and were cited as sources in the Lex Romana Burgundionum attributed to Gundobad, king of the Burgundians (473–516).

[18] Texts drawn from the Codex Hermogenianus achieved status as authoritative sources of law simultaneously with the original work's deliberate eclipse by two codification initiatives of the sixth century.

Then, as part of the emperor Justinian's grand codification programme, it formed a major component of the Codex Justinianeus, which came into force in its first edition across the Roman Balkans and eastern provinces in AD 529.

There has been no attempt at a full reconstruction of all the surviving texts that probably derive from the CH, partly because of the difficulty of distinguishing with absolute certainty constitutions of Hermogenian from those of Gregorian in the Codex Justinianeus in the years of the mid 290s, where they appear to overlap.

Head from a statue of Diocletian, Istanbul Archaeological Museum
Maynier's oil painting of Hadrian and Justinian with the Codex of Roman Law, 1803