Debrett's Guide to the Ranks and Privileges of the Peerage
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Prince Edward's Royal Title - Why Edward Will Be the Duke of Edinburgh When Prince Philip Dies
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Duke" vs. "Prince" – What's The Difference? | Dictionary.com
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Peerage | Britannica
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Duke - Wikipedia
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Duke” vs. “Prince”: What's the Difference? | YourDictionary
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Regency History: A Regency History guide to titles for married daughters of dukes, marquesses and other peers
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