"HistoricalCountry" Polygons

The new geo entity domain "HistoricalCountry" provides useful data about a large collection of historical entities.

Extension in time of the Roman Empire.

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Entity["HistoricalCountry", "RomanEmpire"][{EntityProperty["HistoricalCountry", "StartDate"], EntityProperty["HistoricalCountry", "EndDate"]}]

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This is the maximum geographical extent of the Roman Empire.

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GeoGraphics[{EdgeForm[Black], FaceForm[Red], Polygon[Entity["HistoricalCountry", "RomanEmpire"]]}, GeoBackground -> "ReliefMap", GeoGridLines -> Automatic]

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And this is the maximum extent of the Mongol Empire.

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Entity["HistoricalCountry", "MongolEmpire"][{EntityProperty["HistoricalCountry", "StartDate"], EntityProperty["HistoricalCountry", "EndDate"]}]

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GeoGraphics[{EdgeForm[Black], FaceForm[Red], Polygon[Entity["HistoricalCountry", "MongolEmpire"]]}, GeoBackground -> "ReliefMap", GeoGridLines -> Automatic]

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