King of Prussia during the Napoleonic wars (1770–1840) who ruled from 1797 until his death. LS in French, signed “Frederic Guillaume,” one page, 8.5 x 10, May 29, 1820. Untranslated letter to the poet and princess Constance zu Salm-Reifferscheidt-Dyck. In very good to fine condition, with scattered light foxing and toning, and small splits along folds. Pre-certified PSA/DNA.
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