Prince of Orange who, feeling threatened by Napoleon, proclaimed the Netherlands as his kingdom at the urging of the powers gathered at the Congress of Vienna (1772–1843). LS in French, signed “Votre bon frere, Guillaume,” one page, 7.75 x 9.5, February 9, 1825. Untranslated letter in which William writes to Francis I, who had just been crowned as King of the Two Sicilies, expressing condolences on the unexpected death of his father, Ferdinand I. In fine condition, with central vertical and horizontal folds and mild mirroring to ink. Accompanied by the original transmittal envelope. RR Auction COA.