Did Rome Legally Stop New Synagogues While Allowing Existing Ones to Remain?
5th c. ยท Theodosian legislation
What the ancient record says
Yes, deserves its own card because the distinction reveals how legal restriction worked. A law need not say "burn every synagogue"; the government could say existing buildings may remain but you may not build new ones.
Over time that matters: a growing community, changing neighborhood, an unusable synagogue, a new community elsewhere, if new construction is forbidden, institutional growth is legally constrained and the effect compounds. Repairs/reconstruction were addressed by different laws and circumstances (why the history cannot be one sentence): some provisions protected existing synagogues from mob destruction, others prohibited new construction, other periods restricted rebuilding, not perfectly static.
This makes the history more accurate, not less important: Roman law could protect a synagogue against illegal mob seizure while legally prohibiting construction of another, not contradictory, but regulated inequality.
Read it for yourself. Codex Theodosianus 16.8.27; compare other 16.8 synagogue laws chronologically (with dates).
Evidence strength: Direct legal evidence.