William, Kate to be duke, duchess of Cambridge
By Associated Press
Apr 29, 2011 2:07 AM CDT

Buckingham Palace says Prince William and his bride Kate Middleton will receive the titles of duke and duchess of Cambridge.

The second duke of Cambridge, Prince Adolphus Frederick, was the seventh son of King George III. Defying the Royal Marriage Act, he married his mistress, Sarah Louisa Fairbrother, an actress and a commoner, in 1847. Since the marriage wasn't legal, his children were all illegitimate.

The palace announced the titles in a statement Friday.