I have seen that there are many types of crowns for royalty. My 2 questions are:

1: Are the different types of King crowns "purely esthetical" or can different types of a king crown symbolize different things?

2: If there where kings physically participating in battle or war, could/did they have different crowns for going into battle than they wore at official events and so on, if they wore their crown? (If they had more than one crown of course"

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I have been trying to do research on this but cant seem to find any good answers or sources for this.