The Mid-Subatlantic climatological period lasted from 175 to 750 AD.
Notes on verification
Confirmed verbatim in Wikipedia and several derivative/mirror sources, but all appear to trace back to a single original citation ('Gumerman'), so independent corroboration is limited despite multiple sources repeating it.
Sources
- Climate of ancient Rome (en.wikipedia.org)
- https://encyclopedia.pub/entry/29101 (encyclopedia.pub)
- https://www.ancient-history-sites.com/roman/context/climate/ (ancient-history-sites.com)
- https://handwiki.org/wiki/Earth:Climate_of_ancient_Rome (handwiki.org)
- https://www.detailedpedia.com/wiki-Climate_of_ancient_Rome (detailedpedia.com)