Princess Diana fought with King Charles over his love affair with Camilla Parker Bowles.
The late princess’ biographer, Andrew Morton, recalls a conversation with Diana, in which she said: "I once heard him on the telephone in his bath on his hand-held set, saying: 'Whatever happens, I will always love you.’"
Diana continued, as per Morton: "I told him afterwards that I had listened at the door, and we had a filthy row."
The Princess of Wales separated from the monarch in 1992. The couple eventually filed for divorce in 1996, a year before Diana passed in a car accident in Paris.
Charles and Camilla married each other almost after a decade in 2005. Both his sons, Prince William and Prince Harry attended the royal wedding.