Fabulist \FAB-yuh-list\ , noun;
1. A liar
2. A person who invents or relates fables
Fabulist dates to the 1590's from French fabuliste, which derives from Latin fabula ("story, play, fable, tale"). Fabula literally translates as "that which is told" and is related to fari ("speak, tell"), which ultimately derives from Proto-Indo-European *bha- ("speak"). *Bha- is also the forebear of fame via Latin fama and Old French fame.
Fabula is also responsible for fabulous. Latin fabulosus means "celebrated in fable; rich in myths" which became "mythical, legendary" in early 15th century English. Fabulous meaning "incredible" is first attested in 1600.