I was corrected in an essay on using a capital letter in king in "Louis VII the King of France" and also the capital letter in queen in referring to "Sibylla of Jerusalem who reigned as Queen of Jerusalem".
I had been under the impression that "King of France" and "Queen of Jerusalem" were official titles, referring to a specific position and were therefore capitalised. Where did I go wrong?
You have to prove that your usage of both 'king and 'queen', here, refers to proper nouns (names), otherwise the words should be used as common nouns and not capitalized.
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Does queen need a capital letter in the sentence 'The queen is going to be 90 tomorrow.' ?
You did not go wrong. When using a title like that (etc. Elizabeth, Queen of England or Henry, King of France). Obviously the essay was incorrect.