(though, as is shown on the crown, elizabeth sent her. Prince philip and queen elizabeth ii appear to have the perfect relationship, but season 2 of the crown explores the affair rumours that plagued the early years of their marriage.
Prince Philip Unfaithful
There's no proof he's ever been unfaithful, but over the course of the royal couples' 70+ year partnership, the duke of edinburgh has been labeled a ladies man, and linked to.