apocryphiar
One who rewrites history to their own advantage or tells self-aggrandizing falsehoods.
Martha Gellhorn made a long list of such incidents, concluding that as an "apocryphiar. . . Miss Hellman ranks sublime."
Where it comes from
Coined by war journalist Martha Gellhorn. Blend of apocrypha + liar.
Adapted from the Wiktionary entry apocryphiar (CC BY-SA 4.0).