Youngest brother of Napoleon (1784–1860) who reigned as King of Westphalia from 1807 to 1813, and later served in several official positions in the Second Empire. Manuscript DS, in French, signed “J. N.” and “Jerome Napoleon,” one page both sides, 8.25 x 11.75, June 2, 1815. A power of attorney drawn during the ‘Hundred Days,’ two weeks before Waterloo. In part (translated): “His Imperial Highness Prince Jerome Napoleon…constitutes as his special attorney in fact, Monsieur Jacques Lafitte…to whom he gives power, for him and in his name, to collect and receive from all cashiers.” In fine condition, with light intersecting folds and some show-through from writing on opposing sides. Accompanied by a full translation. RR Auction COA.