Westmorland ( ship ) The Westmorland or Westmoreland was a 26 - gun British privateer frigate , operating in the Mediterranean Sea against French shipping in retaliation for France ' s opposition to Great Britain in the American Revolutionary War . Service history . The most notable incident in her life occurred shortly after she sailed for Britain from Livorno under Captain Michael Wallace in December 1778 , carrying a large monetary payment for her inbound cargo of salt cod from Newfoundland ( Livorno was a trade hub for this commodity ) , food goods , and 57 crates of artistic objects collected by Grand Tour ists such as the Duke of Gloucester , Sir John Henderson and the Duke of Norfolk . She was chased by four French ships , made up of two men - of - war , the " Caton " ( 64 ) and the " Destin " ( 74 ) , and two smaller vessels . Wallace attempted to outrun them but , outgunned as he was , soon felt he had little option but to allow the French to board his ship . She was then allowed by Spain ( then friendly with France though not yet — in formal terms at least — at war with Britain ) to continue to Malaga . At Malaga her artistic contents was passed on from the French government to two trading companies with links to Ireland , despite Wallace ' s protests that the ship was full of " extremely precious goods " ( the French had already seized the " Westmorland " ' s cash cargo ) , and the Spanish king was informed by his prime minister , the Count of Floridablanca , of the art ' s arrival . On Spain ' s declaration of war , king Charles III secretly bought the art from a syndicate of Madrid merchants for 360 , 000 silver reales ( a reduction from their original asking price of 600 , 000 gold doubloon s , but still a sizeable sum ) and had it brought by cart to the capital . ( However , the portraits of Basset and Lord Lewisham were acquired by the Spanish Prime Minister . ) Though the British consul at Cadiz had initially informed the British Admiralty that the " Westmorland " and her cargo had been seized as legitimate ' prizes ' , there followed demands by the British ambassador for the repatriation of the art and ( in a prisoner exchange for French and Spanish prisoners taken by the Royal Navy ) the " Westmorland " ' s crew and the 10 - year correspondence at prime - ministerial level that followed . They all still remain in the Prado Museum , the Real Academia and other Spanish national collections , with only a few exceptions — a package of Catholic relics intended for the Duke of Norfolk , which the Spanish returned unopened to the Vatican ; and Sir Watkin Williams Wynn ' s " Perseus and Andromeda " by Mengs , which has ended up in the collection of Catherine the Great at the Hermitage Museum . Meanwhile , in London in 1784 , the £100 , 000 for which the art had been insured at Livorno was paid out . The " Westmorland " was renamed , re - commissioned into the Spanish fleet but eventually re - captured in the Caribbean by the British . In 2012 an exhibition of many of the art works was held at the Ashmolean Museum at Oxford University and then traveled to the Yale Center for British Art in New Haven , Connecticut in the United States .