"A ___ ought to have a good memory": Quintilian (4)

I believe the answer is:

liar

(Other definitions for liar that I've seen before include "Perjurer" , "Pinocchio, at times" , "One telling untruths" , "Worse than a thief" , "Untruthful person (Billy in Schlesinger film)" .)

I've seen this clue in The New York Times.

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