A question about flags.

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Although the folder containing the tga files it's called ”flags”, we find there mostly coats of arms.

The rule requires to be used flags or coats of arms?

There is a strict rule?

 

[Edlar89]

Most of the nations (if not all) during the 15th century didn't have flags. They're a fairly new concept for a nations identity. Before then they all had a coat of arms.

 

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An example is England, where Henry IV's arms is used in game, valid, if I know well, only for three kings, although the flag of St George's Cross was in use even before 1399.

 

[Edlar89]

An example is England, where Henry IV's arms is used in game, valid, if I know well, only for three kings, although the flag of St George's Cross was in use even before 1399.

It's actually King Richard I "The Lionheart"'s arms in game (King Henry IV's was quartered with the French arms). See this page. The St. George's Cross was more of an emblem of England until the 16th Century when it became the official flag of England.

A good example of why the COAs are used is France. The tricolore flag was only adopted on 15 February 1794 (almost at the end of the game), whereas the COA of a blue field and 3 fleur-de-lis lasted from 1376–1830 (not including Napoleon's empire).