As a result of his marriage, the Queen confer a Dukedom on
Prince William of Wales. His titles are Duke of Cambridge, Earl of
Strathearn and Baron Carrickfergus.
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Donnchadh de Strathearn died in 1355.
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Their official titles are the Duke and Duchess of Cambridge. He
is also officially known as Earl of Strathearn and Baron
Carrickfergus.