Théodore (Théo) Hannon (1851-1916) was a Belgian painter, watercolorist, engraver, and man of letters. As a man of letters, he was a scenarist, theatrical-parodist, and poet. As a poet he enjoyed the rare honor of being mentioned in glowing terms—along with French contemporaries Charles Baudelaire, Gustave Flaubert, Stéphane Mallarmé, Tristan Corbière, and Paul Verlaine—by Des Esseintes in Joris-Karl Huysmans' famous decadent novel, À rebours