Gregorian and Hermogenian codes in the tetrarchic years make constitutions copyable as a law file
In the 290s private codes of imperial constitutions (Gregorianus, Hermogenianus) made tetrarchic law more copyable. Copyable constitutions can still be cruel (Price Edict). In the causal graph this event strengthens Judicial independence erosion (court capture), a driver that strengthens Rule of Law Gap from the Highest Governance Score — a worsening welfare path.
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In the 290s private codes of imperial constitutions (Gregorianus, Hermogenianus) made tetrarchic law more copyable.
Context
Copyable constitutions can still be cruel (Price Edict). This stores access to a law file versus purely oral command.
Diocletian’s documented role is bounded by other offices and collaborators named in the sources below.
Codex Gregorianus / Hermogenianus as private collections of imperial constitutions around the 290s. Analogical: more copyable law versus oral whim. Medium.
Why it matters
A code is not an independent bench. Keep persecution edicts as law too.
Who was responsible
Contribution type and responsibility level for each recorded actor — not sole-author shorthand.
Diocletian
PersonDirect responsibility
responsibility level 0.4 · verified
What changed
Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.
- FactGregorian and Hermogenian codes in the tetrarchic years make constitutions copyable as a law file
- strengthensDriverJudicial independence erosion (court capture)
- strengthensIndicators (4)Rule of Law Gap from the Highest Governance Score
impact weight 0.5 · Effect from 1 January 295 · verified
- Worse
Strengthens · Relationship strength 0.36 (weight 0.5 × strength 0.72)
Observed
43.9 Score · 43.9 above the normal line (2024)
Worse than normal26 readings, 1996–2024: rose from 43 Score to 43.9 Score.
Normal is zero · any amount = worse
Weakens · Relationship strength 0.35 (weight 0.5 × strength 0.7)
Observed
0.55 index score (0-1) · 0.26 below the normal line (2024)
Worse than normalAbove normal = better
Weakens · Relationship strength 0.34 (weight 0.5 × strength 0.69)
Observed
0.62 score from 0 to 1 · 0.25 below the normal line (2024)
Worse than normal125 readings, 1900–2024: rose from 0.37 score from 0 to 1 to 0.62 score from 0 to 1.
Above normal = better
All indicators on this path (4)
Weakens · Relationship strength 0.15 (weight 0.5 × strength 0.3)
Observed
42.5 index score (0-100) · 7.53 below the normal line (2025)
Worse than normalAbove normal = better
Evidence
The sources behind this fact and its verification state.
- 1.Roman law texts including Codex Theodosianus extracts — GrenobleUniversité Grenoble Alpes / Droit romain · High credibility · verified
- 2.Cambridge Ancient History — later Roman / Hun chaptersCambridge University Press · High credibility · verified
What the sources establish
Grenoble Roman-law pages and Cambridge independently date these codes to the tetrarchic cluster.
Established: Gregorian/Hermogenian collections in this era. Not established: that judges became independent in a modern sense.
Causal path
How this event connects to drivers and indicators in the graph.
- ActorDiocletian
- contributed toFactGregorian and Hermogenian codes in the tetrarchic years make constitutions copyable as a law file
- strengthensDriverJudicial independence erosion (court capture)
- strengthensIndicatorRule of Law Gap from the Highest Governance Score
Cite this page
Factrail. (2026). Gregorian and Hermogenian codes in the tetrarchic years make constitutions copyable as a law file. Factrail. https://factrail.ai/facts/di-legal-codification-beginnings
https://factrail.ai/facts/di-legal-codification-beginnings
Accessed 16 October 2026.
By the Factrail desk · Method: how we source and score · Last reviewed
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