As political geography changes, how do we categorize? This is a recurring theme, and to me it looks like we have been dealing with it on a case by case basis. Is there a set answer, or is the answer "it all depends"?
Example: How should Darmstadt, Germany, be categorized? Darmstadt is a city inside the state of Hesse, located in the southern part of the Rhine-Main-Area. It was part of Hesse-Darmstadt when Hesse-Darmstadt existed. But is existed before and afterwards.
Background: In 1567, Hesse was divided by a kind father, Philip I, among his four sons, thus creating: Hesse-Kassel (became the Electorate of Hesse in 1803/4), Hesse-Marburg (disappeared in 1604), Hesse-Rheinfels (disappeared, was recreated and died out in 1834), and Hesse-Darmstadt (dissolved in 1806).
Each jurisdiction could be a sub-category under Hesse. The categorization could be: German: "Hessen-Darmstadt, Hessen" > "Hessen, Deutschland"; and English: "Hesse-Darmstadt, Hesse" > "Hesse, Germany". And the city of Darmstadt could be categorized both under "Hesse, Germany" and under the sub-category "Hesse-Darmstadt, Hesse."
The gist of my question is general, about the correct categorization and sub-categorization of no longer existing places or places which have changed over the years, so It also applies to place like Alsace or the Duchy of Schleswig. When political geography changes, what is the best way to handle former or following jurisdictions?