King Charles' failed marriage to Princess Diana means he is unable to carry the brand of "family monarchy" like his parents, a royal author and historian has claimed.
This week marks the 75th anniversary since the late Queen and Duke of Edinburgh tied the knot at Westminister Abbey in a marriage that lasted for 73 years until Philip's death last year.
In contrast, the new King Charles saw his union with Diana end in divorce - although he has since remarried with him and Queen Consort Camilla celebrating 17 years of marriage in April.