Manuscripts, Sweden. KARL XIII (1748–1809–1818). Regent of Sweden during the minority of Gustaf IV Adolf 1792–1796. He was the younger brother of Gustaf III. Beautiful mourning letter (due to King Gustaf III's death) with black edges and black seal. Signed Carl and dated Drottningholm Castle September 26, 1792 to Count Rosen by courier. Scarce item in good quality!