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.

King Charles championed the royal family’s dedication to Commonwealth Day, calling for unity alongside Queen Camilla, Prince William and Kate Middleton at Westminster Abbey after he and Kate missed last year’s service due to their cancer treatments.

King Charles hailed the work of the Commonwealth in bringing countries together as he and Britain's senior royals gathered at London's Westminster Abbey on Monday for annual celebrations for the international organisation he leads.