 The Prince of Piombino, who shared territorial sovereignty over Elba with the Duke of Tuscany, ceded his authority over the thirteen square kilometres of Porto Longone to the Spanish.This was the only case of territorial expansion in the history of the "Presidi".From May to July 1646, Orbetello successfully resisted a siege by troops sent by the French royal minister Mazarin in an attempt to dislodge the Spaniards from Italy.