The King’s youngest son returned to London without his wife, Meghan, and their children, Prince Archie and Princess Lilibet.
Prince Harry was among the first royals to enter the Abbey.
The coronation was the first time that Harry publicly met members of his family since the book was released.
Royals expert draws parallels between Prince Harry and King Charles 01:04 - Source: CNNThe palace previously said it wouldn’t comment on whether the duke would appear on Buckingham Palace’s famous balcony following the ceremony at Westminster Abbey.
Williams added that Harry’s presence was a “show of unity” – but the extent of that unity remains to be seen.