Constantine, who was overthrown in 1973, dismissed recent polls which suggested the majority of Britons would prefer Prince William to leapfrog Prince Charles to the throne.
Prince William's brother, Prince Harry, who is serving with the Army in Afghanistan, is thought to have been told in an email.
Distinguished guests of the royal nuptials included the newlywed Duke and Duchess of Cambridge, Prince William and Catherine Middleton, and Prince Harry.
Prince William, the Duchess of Cambridge and Prince Harry followed in a second carriage.
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Other guests include Kate Middleton's former headmaster, William's Eton housemaster and Sir John Major, the former British prime minister who was appointed guardian of Prince William after his mother's death.
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Nicholas Davies, the author of "William: The Rebel Prince, " said he thinks William was pressured to come through with the engagement.
Prince William and Kate Middleton are to marry at Westminster Abbey on 29 April.
Britain says Prince William's deployment for training as a helicopter rescue pilot is routine.
The Queen made Prince William the Baron Carrickfergus ahead of the ceremony on Friday morning.
Andrews University and studied art history in the same rooms Prince William would finish his course.
Miss Middleton and Prince William seem to have set off a trend of their own.
And that is why Prince William and King Juan Carlos will be in attendance.
Prince William and Miss Middleton met when they were both students at St Andrews University.
Meanwhile, Prince William decided not to attend the British Military Tournament in London on Sunday.
The wedding of the U.K.'s Prince William and Kate Middleton provided a huge boost.
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The appeal was launched in April by Prince William who has agreed to become a patron.
At any rate Prince William, son of Charles and Diana, has come out of it well.
Andrews University in Scotland, the alma mater of well-heeled, privately educated students like Prince William.
Prince William studied geography and Middleton studied history of art before both graduated in 2005.
Short of putting Prince William in a super-hero's cape, the royal household could scarcely do better.
David Cameron and Prince William have both contacted New Zealand's Prime Minister John Key to offer support.
Andrews, at which she is reputed to have attracted the attentions of her future husband, Prince William.
If Prince Charles can engage in what Mr Grieve calls "advocacy correspondence", why not Prince William too?
Prince William, who is colonel of the Irish Guards, wore the regiment's red tunic during the ceremony.
Prince William and Kate Middleton are due to get married at Westminster Abbey on Friday 29 April.
"Prince Harry and Prince William are a double act for the rest of their lives, " the source said.
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Prince William's military deployment to the islands last year further fueled tensions, drawing sharp criticism from Argentinian officials.
There've been 350 peer reviewed studies since that we believe resoundingly demonstrate the recovery of Prince William Sound.
Our correspondent added that government sources had indicated the changes were very unlikely to affect Prince William's position.
He said there is one British serviceman who won't have to worry about the dangers of Afghanistan: Prince William.
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