Did the Roman Empire Eventually Claim Authority Over How Yahudim Could Read, Translate, and Interpret Their Own Sacred Writings?
Primary: Justinian, Novella 146 · 553 CE
What the ancient record says
By Justinian's reign, yes. What the law reaches: language, reading in Lashon Qanaʿan (Hebrew) vs understandable translations; Greek, Latin, other languages permitted.
Translation, Septuagint explicitly preferred, Aquila also permitted. Interpretation, accuses certain interpreters of manipulating people who cannot understand the source language.
Secondary tradition, δευτέρωσις (deuterosis) prohibited (exact identification disputed). Community authority, leaders obstructing the policy can face corporal punishment and confiscation.
Theology, certain beliefs condemned by imperial law. Capital punishment, Chapter 2 prescribes death for specified condemned teachings.
A massive expansion of state authority. Compare: 2nd century Justin's interpretive ownership claim, then late 2nd century Victor's institutional pressure, then 4th century Anti-Judaizing canons, then Constantine's Pasakh standardization and religious legislation, then 5th century Law regulating marriage, conversion, synagogues, office, status, then 6th century Justinian reaching directly into the synagogue's handling of the sacred writings.
Documented. Does not prove: Rome secretly rewrote every Lashon Qanaʿan (Hebrew) scroll (Novella 146 proves regulation of reading, translation, interpretation, community authority, not manuscript replacement); that the Septuagint became the only text allowed (Aquila permitted); that Lashon Qanaʿan (Hebrew) was completely outlawed (the law supports translation and bars leaders from blocking it, a universal total ban goes beyond the document); that deuterosis definitely means the Mishnah (disputed); that everyone sentenced under Chapter 2 was actually executed (a capital statute proves the penalty was prescribed; executions need separate evidence).
Does prove: Justinian wanted Yahudim to accept Christian interpretation (openly expressed, no hidden conspiracy needed). Strongest defensible conclusion: by 553 CE a Roman emperor claimed and exercised legal authority to regulate significant aspects of how Yahudi congregations handled their own sacred writings, language, translation, interpretive practice, community enforcement, and theological boundaries, directly from imperial legislation.
Read it for yourself. Justinian, Novella 146, Preface, Ch. 1, Ch. 2, Ch. 3 (whole document).
Evidence strength: Extremely strong direct imperial legal evidence.