Will The Duchess become Queen when The Prince becomes King?
As was explained at the time of their wedding in April 2005, it is intended that The Duchess will be known as HRH The Princess Consort when The Prince of Wales accedes the throne.
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Will The Duchess become Queen when The Prince becomes King?
http://www.princeofwales.gov.uk/faqs/will_the_duchess_become_queen_when_the_prince_becomes_king__1492385153.html