(n.) One who invents or writes fables.

Ananias Baron Munchausen Father of Lies Satan Sir John Mandeville consummate liar dirty liar equivocator fabricator fabulist falsifier fibber fibster frame frame-up habitual liar liar mythomaniac palterer pathological liar perjurer prevaricator pseudologist pseudologue put-up job spinner of yarns storyteller yarn spinner yarner