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Suo jure is a Latin phrase meaning "in his/her own right".
It is commonly encountered in the context of titles of nobility or honorary titles, e.g. Lady Mayoress, and especially in cases where a woman holds a title in her own right rather than through her marriage.
An exception to this is a queen in her own right, who is referred to as a "queen regnant", rather than a "queen suo jure".
Examples of suo jure titles
- Eleanor, Duchess of Aquitaine, French, then English queen consort, duchess suo jure
- Mary of Baux-Orange, was suo jure Princess of Orange
- Mary, Duchess of Burgundy, Queen consort of the Romans, duchess suo jure
- Anne Marie Louise d'Orléans, Duchess of Montpensier, French princess, peeress suo jure
- Hawise, Duchess of Brittany, duchess suo jure
- Henrietta Godolphin, 2nd Duchess of Marlborough, English peeress suo jure
- Maria Theresa of Austria, Austrian archduchess, Hungarian and Bohemian queen regnant
- Elizabeth of Russia, Russian empress regnant
- Princess Wilhelmine, Duchess of Sagan, Baltic princess, duchess suo jure
- Princess Alexandra, 2nd Duchess of Fife, British princess, duchess suo jure
- Cayetana Fitz-James Stuart, 18th Duchess of Alba, Spanish grandee suo jure
- Patricia Mountbatten, 2nd Countess Mountbatten of Burma, British countess suo jure
- Jane Heathcote-Drummond-Willoughby, 28th Baroness Willoughby de Eresby, British baroness suo jure
- Rosalinda Álvares Pereira de Melo, 1st Duchess of Cadaval-Hermès, Portuguese duchess suo jure
- Diana Álvares Pereira de Melo, 11th Duchess of Cadaval, half-sister of the above, Portuguese duchess ad personam and suo jure
- Margaret of Mar, 31st Countess of Mar, Scottish peeress suo jure
- Catherine Willoughby, 12th Baroness Willoughby de Eresby English baroness suo jure
- Joan of Kent, suo jure 4th Countess of Kent and 5th Baroness Wake of Liddell.
- Queen Anne Boleyn, of England, Marquess of Pembroke suo jure
- Catharina-Amalia, Princess of Orange became, in 2013, the first suo jure Princess of Orange since Mary of Baux in 1417
- Princess Elisabeth, Duchess of Brabant became, in 2013, the first suo jure Duchess of Brabant ever.
- Infanta Leonor of Spain, Prince of Asturias suo jure
- List of peerages created for women in the peerages of the British Isles
- List of peerages inherited by women in the peerages of the British Isles
- Jure uxoris
- List of Latin phrases
- Sambrook, James (January 2008). "Godolphin, Henrietta, suo jure duchess of Marlborough (1681–1733)". Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/92329. Retrieved 2012-05-18.