Henrietta Grosvenor, Countess Grosvenor, née Vernon (+1828) by Gainsborough - Henrietta Vernon, daughter of Henry Vernon of Hilton Park, Staffordshire. Henrietta had an affair with Henry, Duke of Cumberland, the younger brother of George III. The couple were discovered in flagrante delicto in 1769, which led to Grosvenor bringing an action against the Duke for "criminal conversation" (that is, adultery).
In flagrante delicto (Latin: "in blazing offence") or sometimes simply in flagrante (Latin: "in blazing") is a legal term used to indicate that a criminal has been caught in the act of committing an offence (compare corpus delicti). The colloquial "caught in the act", "caught red-handed", or "caught rapid" are English equivalents. Aside from the legal meaning, the Latin term is often used colloquially as a euphemism for someone's being caught in the midst of sexual activity.
HRH Henry Frederick (1745–1790), 1st Duke of Cumberland and Strathearn. In 1769 Henry was sued by Lord Grosvenor after the Duke and Lady Grosvenor were discovered " in flagrante delicto" Lord Grosvenor was awarded costs and damages of £13000 ( 2014 rate £1,5000,000) A costly romp!
Carlo Gesualdo da Venosa (1566 – 1613) was an Italian musician, who was Prince of Venosa and Count of Conza. As a musician he is best known for writing intensely expressive madrigals and pieces of sacred music that use a chromatic language not heard again until the late 19th century. He is also known for his cruelty and lewdness: the best known fact of his life is his gruesome killing of his first wife and her lover upon finding them in flagrante delicto.