Revealed: Why Prince Harry has chosen William to be his best man at Royal wedding to Meghan Markle

Prince Harry chose Prince William to be his best man at his wedding to Meghan Markle because they are "as close as brothers can get", royal experts said.

On Thursday, Kensington Palace revealed that Prince William had been asked to Harry's best man when he marries Ms Markle on May 19 at St George's Chapel.

Prince Harry had been the Duke of Cambridge’s best man at his wedding to Kate Middleton in 2011.

Royal commentators have revealed why they think Harry chose his brother, who welcomed his third child into the world on Monday, to be his best man.

Richard Fitzwilliams told the Standard: “Harry has repaid William’s asking him to be his best man in 2011 by, as predicted, asking him to be his on May 19th.

“Royals can pick who they like to be best man, but it would only be natural to choose a sibling or relative. It depends on the circumstances.

“When the Duke of Windsor married Wallis Simpson in 1937 no member of the royal family attended and the best man was Major Edward 'Fruity' Metcalfe,” he added.

Phil Dampier, author of Royally Suited: Harry and Meghan in their own words, believes that Harry chose William because of their close bond.

He said: “Harry and William are as close as brothers can get.

“Partly because only they can understand what it's like to be royal, but also because of the way they supported each other after their mother's death.

“I think Harry feels blessed he hasn't got the top job and he's determined to support William as much as possible.

“They love taking the mickey out of each other and he will expect a lot of that in the speech, notably a joke about him missing the Cup Final.” he continued.

Royal aide Grant Harrold noted that Harry is slightly breaking away from royal tradition by choosing a sibling rather than the royal tradition of a “supporter”.

He explained: “Harry is following in the footsteps of his brother and father by having his brother as his best man. Prince William had Prince Harry as his best man.

“But we should note this is again a slight break from royal tradition as royal grooms sometimes opt for supporters rather than a best man.

“This is handy when the royal like Prince Charles was able to have his two brothers, Princes Andrew and Edward, as his supporters at his wedding to Lady Diana Spencer in 1981 rather than having to choose just one best man,” Mr Grant added.

Additionally, Prince Charles and Prince Andrew were Prince Edward’s supporters when he married Sophie-Rhys Jones in 1999.

Since William broke the custom of choosing supporters in 2011, Mr Fitzwilliams said: “The idea of supporters seems to have been abandoned as being archaic.”