Belgian playwright, poet, and essayist (1862–1949) awarded the Nobel Prize in Literature in 1911. ALS in French, signed “M. Maeterlinck,” one page both sides, 4.5 x 7, no date. Untranslated letter in French, confirming a promise he could not keep. Light scattered foxing, a couple stray ink marks, and a ballpoint notation to top, otherwise fine condition. RR Auction COA.