By way of (unidentified) allusion; and deathplace of Lucien Buonaparte. Named by Byron in 1810-08-23 describing his frolics at the Capuchin Convent in Athens.
Byron to James Cawthorn, from The Volage Frigate off Ushant July 7th. 1811
An island at the south-western end of the English Channel which marks the north-westernmost point of metropolitan France. Wiki