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Depending on the court it is either "Your Honour", "My Lord", or "Sir/Ma'am"When in doubt use "Your Honour" until you are instructed otherwise
Yes, Prince William is a proper noun, the name of a specific person. A proper noun is the name of a specific person, place, or thing.
His Royal Highness, the Crown Prince.
yes
Usualy it is "Your Honour", or "My Lord" depending on the court, in some courts it would be "Sir" or "Ma'am"
Prince Valiant , the eponymous protagonist , doesn't have a proper name ; see related link .
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No, prince is a common noun, a word for any prince of any kind.A proper noun is the name of a specific person, place, thing, or a title; for example:Albert II, Sovereign Prince of MonacoPrince Edward Island, CanadaPrince Global Sports LLC, Bordentown, NJ"The Prince of Tides", 1991 move with Barbra Streisand and Nick Nolte
prince is a comman noun unless it is a specfic prince then it's proper.
Capitalization
Not proper grammar, just use other terms to indicate you agree, if you do.
In most places, a prince is best addressed as 'Your Highness.' There may be more region specific titles as well.