William to become a duke, but of where?

Britain's Prince William laughs during a visit at the Royal Navy Submarine Museum, in Gosport, south England, Tuesday June 10, 2008. The Prince toured HMS Alliance, a WWII submarine, and saw the Royal Navy's first ever submarine, the Holland 1, before opening the Area of Remembrance. William began his two-month attachment with the Royal Navy, undergoing basic naval training, to learn core skills like navigation and sea safety. (AP Photo/Lefteris Pitarakis, pool)

April 28, 2011 11:14:30 AM PDT
If past is prologue, Prince William will become a duke when he marries, and his bride will thus become a duchess.