A courtesy title is a form of address and/or reference in the British system of nobility used for children, former wives and other close relatives of a peer, as well as certain officials such as some
The son of the current Duke of Northumberland has the courtesy title of Earl Percy, and is addressed and referred to as "Lord Percy".
John Dyson, first Justice of the Supreme Court with the judicial courtesy title of Lord
Sarah Ferguson
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Sarah Margaret Ferguson, formerly Sarah, Duchess of York, and commonly known as Fergie, is a British author, spokesperson, and television personality. She is the ex-wife of Andrew Mountbatten-Windsor,
Courtesy titles in the United Kingdom
…Highness the Princess of Wales after divorce became Diana, Princess of Wales. The same happened to Her Royal Highness the Duchess of York, who became Sarah, Duchess of York. Civil partners of someone using a courtesy title are not entitled to use their partner's title…
Ferguson in 2017
The Duke and Duchess of York on their wedding day
Andrew and Sarah in Townsville, 1988
The then-Duchess of York at the Royal Welsh Show, 1991