What is correct way to address royalty?

I am working on a play, so am trying to find these answers out for research purposes. When addressing a King (in this play, it is King Charles II) what would you say? ie, Your Royal Highness or Your Majesty etc. And how would he be referred to? ie His Royal Highness etc? Likewise, how you to address or... show more I am working on a play, so am trying to find these answers out for research purposes.

When addressing a King (in this play, it is King Charles II) what would you say? ie, Your Royal Highness or Your Majesty etc. And how would he be referred to? ie His Royal Highness etc?

Likewise, how you to address or refer to Lords, Ladies, Dukes and Duchesses?
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