Last week the university of Eboracum explained the Rattus rattus conquest of Europe. And then its reconquest.
Rattus rattus isn't quite the feature he used to be, but that is less because our sanitation and ratcatching has improved so much as that Rattus norvegicus has displaced him.
We learn there were two heydeys of the former rodent. First was the Roman expansion along with, we may assume, the secondary-states such as held along the limes in Germany (especially). Then this population crashed, later enjoying a Renovatio. Unlike the Carolingians, never really a resurgence of the Roman people as such; this new generation of squeaker (still R-R) actually did travel from a founding Mediterranean population. Trade had recovered in the Middle Ages; as had population, and population-density.
A vindication of Heather and Ward-Perkins, to the extent we still wanted one.
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