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It depends. If he is already a prince, then she becomes a princess. Unless the prince also has another title such as Duke or Earl, etc. The wife of a prince that is also a duke would be referred to as a Duchess. The wife of a prince that is also an Earl would be called a Countess.
If a princess is the heir apparent to the throne than she will become Queen no matter who she marries. A grand duke is a high noble status and would be considered a good match for a princess.
Her title is the Duchess of Cambridge, she would remain so
HRH Princess
Her title would not change unless they decided to give her a title which is highly unlikely unless someone goes out and kills 6 of the royals
She did not rule over anywhere. She was due to become Queen Consort, when her husband would have 'reigned' (rather than ruled) - that is to say, he would be there to advise, encourage and warn his elected government.
It is dependent upon the country in which the marriage takes place. In most countries today, there are no laws against marriage between a royal and commoner. For example, if a prince married a commoner girl, she would still be a princess and their children princes and princesses. In most European countries, a princess does not pass her princely status on, no matter who she marries, but if she marries a commoner, he will usually be made a duke, count, etc. and their children will be lords or ladies and be in line for the throne. In royal countries which are less modern, men can still marry commoners but princesses must marry within the royal family or their children will have nothing. For example, Princess Sayako of Japan lost her title, allowance and all other royal vestiges because she married a commoner and the law says that will happen if she marries outside of the family, which princesses always do. Basically, as far as Europe is concerned, there is no issue
Titles Given by Queen Elizabeth:Shortly before their wedding, Queen Elizabeth released the titles William and Kate will be known by. Kate's first title will be Duchess of Cambridge, her second title is Countess of Strathearn, and her third title is Baroness Carrickfergus.Previous answer: Her Royal Highness Princess William of WalesAfter her marriage to Prince William of Wales, Kate Middleton's title will be Her Royal Highness Princess William of Wales. On the engagement announcement, Kate used her full name, Catherine. So she will likely be known as Princess Catherine of Wales.If Prince William receives a dukedom following the marriage, she will be known as Duchess in addition to Her Royal Highness.Kate Middleton will not be "Princess Catherine." Unless Prince William granted a peerage on marriage, she will be Princess William - just as the present Duchess of Gloucester was "Princess Richard" before the death of her father-in-law and the wife of Prince Michael of Kent is "Princess Michael." So she will be Her Royal Highness Princess William of Wales.Diana Princess of Wales was never "Princess Diana," no matter what the press called her. At the time of her marriage, she became HRH The Princess of Wales; after her divorce, she was Diana, Princess of Wales. The title "Princess" with a woman's given name is reserved for those who are so titled from birth - the daughters of the Sovereign or of a Prince.
Yes, one would curtsy or bow to Camilla, as she is the Princess of Wales(she doesn't use that title, she uses the title Duchess of Cornwall)
The correct title is Princess Royal. The title Princess Royal came about as a response to the French title 'Madame Royal'. The title is given to the eldest daughter of a monarch, provided there is no-one who already has the title. Thus, Princess Anne is styled the Princess Royal, while her mother, Queen Elizabeth II, never was, as her aunt, Princess Mary already carried the title.
If he dies without children, Kate will be the dowager (whatever her former title was). And then Harry and his line will succeed to the throne. However, if William dies before he marries Kate, then Kate gets no title at all.
He would not receive any title or style by virtue of marrying a Princess of the United Kingdom; he would not become a Prince by courtesy, as would a woman who married a Prince of the United Kingdom. If the Sovereign decided to grant him a peerage, that is her (or his) prerogative.