Earl Spencer was the French privateer brig Aventurier, which the British Royal Navy captured in December 1799.

[5] One month earlier, on 29 November, Aventurier had captured the American ship Cato and taken her master, John Parker, and his crew prisoner.

[3] On 14 April "the celebrated General Arnold" arrived at Plymouth to "fit out a letter of marque, late Aventurier, a fine corvette of 14 guns.

It stated that she was a French prize, her master was J.P. Neal, her owner was G. Arnold, and her trade was London cruizer, i.e., a privateer.

[2][a] On 23 June the Spanish brig Maria del Mont Camille came into Plymouth, a prize to Earl Spencer.

Maria del Mont Camille had been sailing from Guyon to Corunna with a cargo of coals and iron when she was captured.

[14] On 9 March 1802 Lloyd's List reported that Earl Spencer, Craft, master, had wrecked at Gibraltar on her way from Newfoundland.