Francisque Tapon-Fougas (1810–93) was re-discovered in the 20th century by Raymond Queneau and André Blavier, his writing guaranteeing him a prominent place in the pantheon of fous littéraires, or outsider writers. He wrote many plays (often using the name of the Greek philosopher Thalès de Milet), and many poems (considering himself the 'Lamartine of the Auvergne'), and was convinced that he was a great writer, although none of his plays was performed. Characters in his plays (particularly writers) suffer from persecution, and Blavier speaks of Tapon-Fougas's paranoia, his synaesthetic hallucinations, his delusions of literary grandeur, and his constant changes of address as a defence strategy.
Links to my other posts on André Blavier's Les Fous littéraires are below:
André Blavier #1: Jean-Pierre Brisset, Paulin Gagne
André Blavier #2: Alexandre Ansaldi, G. Clair/Rupin Schkoff, Camarasa
André Blavier #3: Hyacinthe Dans
André Blavier #4: Ernest de Garay, aka Karl-des-Monts
André Blavier #6: Jules Allix