Cartogram of the Roman Urban Population
Podcast Episodes: Season three.
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Christianity was an urban religion, flourishing in the towns and cities. Only its Marcionite variant really captured the rural population. The Roman empire was remarkably urbanised. During the high Middle Ages, call it 1300, only one in twenty Europeans resided in towns and cities. Modern studies believe that one in four people in the Roman empire lived in towns and cites. The United States did not achieve Roman levels of urbanisation until the late 19th century.
The Cartogram
A cartogram is a thematic map in which geography is distorted to show some other variable. This cartogram distorts each area in the Roman empire so that its size is proportional to its urban population. Areas in red are majority Latin speaking, and those in dark blue are majority Greek speaking.
Italy and Egypt contain the most urbanites.

Cartogram of the Roman Urban Population. Source: John William Hanson (2018), Oxford Roman Economy Project. Licenced under the Creative Commons Attribution-Share Alike 4.0 International licence.