King of Denmark and Norway (1749-1808) who reigned from 1766 until his death; when his ability to govern was disrupted by mental illness—including episodes of paranoia, self-mutilation, and hallucination—his son, later Frederick VI, acted as unofficial regent. LS in Danish, signed “Christian R,” one page, 8 x 12.5, September 6, 1797. Untranslated official letter. In fine condition. Encapsulated in a PSA/DNA authentication holder.
