Prince William has "a notably short fuse" in private and can sometimes be difficult to handle, a royal author has claimed.
Journalist Robert Jobson writes that the Duke of Cambridge "can be a bit of a shouter" and his "temper can "blow up at any time" when the future king is frustrated or when an issue concerns his family.
Mr Jobson, writing in the Mail as William prepares to mark his 40th birthday, quotes royal sources who described the prince as an emotional character who, along with his brother Harry, has occasionally unpredictable "extreme mood swings" - as did their mum, Diana.
