Sovereign Prince of Orange (1650-1702) who served as King of England, Scotland, and Ireland from 1689 until his death. ALS in French, signed “Prince d'Orange,” one page, 6.75 x 9, April 1697. Untranslated handwritten letter by William as Prince of Orange. In fine condition, with a small light stain. Encapsulated in a PSA/DNA authentication holder.