GEORGE IV: (1762-1830) King of the United Kingdom 1820-30. L.S., Georgius P.R, two pages, folio, Carlton House, London, 1st July 1812, to King Ferdinand I of the Two Sicilies, in Latin. George IV, in his capacity as Prince Regent, congratulates King Ferdinand I for the birth of his grandson, Carlo Ferdinando, son of future King Francis I, and states `We received with joy Y.M letters, by which we learned that the Spanish Infanta Maria Isabel, Crown Princess of both Sicilies, and beloved daughter in law and granddaughter of Y.M, gave birth to a Prince, whose name is Carlo Ferdinando…´. George IV signs beneath the signing formula, which bears also at the heading `In the name and Vice-King´. Countersigned Castlereagh at the foot. With blank integral leaf. Accompanied by the original envelope bearing a paper seal affixed. VG £200-300 Ferdinand I (1751-1825) King of the Two Sicilies 1816-25, after his restoration following victory in the Napoleonic Wars. Before that he had been, since 1759 Ferdinand III of the Kingdom of Sicily and Ferdinand IV of Naples. Francis I (1777-1830) King of the Two Sicilies 1825-30. .Maria Isabella of Spain (1789-1848) Queen of the Two Sicilies, as second wife of King Francis I. Prince Charles Ferdinand (1811-1862) Prince of Capua. Royal Prince whose birth is mentioned in the letter, born 10th November 1811. Robert Stewart (1769-1822) Marquess of Londonderry, known as Lord Castlereagh. Secretary of State for Foreign Affairs 1812-1822.