Portrait of Lady Hamilton. Dame Emma Hamilton (born Amy Lyon; 26 April 1765 - 15 January 1815), generally known as Lady Hamilton, was an English maid, model, dancer and actress. She began her career in London's demi-monde, becoming the mistress of a series of wealthy men, culminating in the naval hero Lord Nelson, and was the favourite model of the portrait artist George Romney. In 1791, at the age of 26, she married Sir William Hamilton, British ambassador to the Kingdom of Naples, where she was a success at court, befriending the queen, the sister of Marie Antoinette, and meeting Nelson.