Prince Harry reportedly made the decision to attend the King's Coronation a month ago but delayed confirming it publically as he had demands for his children.
A former equerry, who is close to both Prince Harry and William, said he was aware of the Duke of Sussex's plans at the beginning of March, reports the Mirror.
It has been claimed that the main reason Harry delayed confirming his attendance is that he wanted some recognition by the Royal Family for his children Prince Archie and Princess Lilibet.