Duke of Clarence and St Andrews
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While there had been several creations of Dukes of Clarence (and there was later a Duke of Clarence and Avondale), the only creation of a Duke of Clarence and St Andrews was in 1789 for Prince William, third son of King George III. When William succeeded his brother to the throne in 1830, the dukedom merged in the crown.
Dukes of Clarence and St Andrews (1789)
- See also Earl of Munster (1789)
- The Prince William, 1st Duke of Clarence and St Andrews (1765–1837), third son of George III, acceded in 1830 as William IV. All of his honours merged with the crown, and he had no legitimate male issue.