The Prince of Wales will travel to Estonia from March 20 to March 21 Prince William is gearing up to go abroad to Estonia in what marks the second trip there by a member of the British royal family in recent months.

The Princess of Wales honored her father-in-law, King Charles, in the traditional way and made a subtle homage to Queen Elizabeth during Monday’s church service.

Middleton — who scaled her royal schedule back last year due to her cancer diagnosis — joined Prince William, King Charles, Queen Camilla, Princess Anne, Prince Richard, Duke of Gloucester and Birgitte, the Duchess of Gloucester, for the commemoration.