In the movie Godfather III...?

Question

Joey Zasa says, "All bastards are liars. Shakespeare wrote poems about it."
Did Shakespeare write any poems about all bastards being liars?
.

Answer 1

No, but in King Lear the Duke of Gloucester's bastard son Edmund is evil/two-faced and one of Shake's most despicable villains.

Answer 2

To be more precise:

King Lear:

Edmund, act I, scene 2:
This is the excellent foppery of the world, that,
when we are sick in fortune,--often the surfeit
of our own behavior,--we make guilty of our
disasters the sun, the moon, and the stars: as
if we were villains by necessity; fools by
heavenly compulsion; knaves, thieves, and
treachers, by spherical predominance; drunkards,
liars, and adulterers, by an enforced obedience of
planetary influence; and all that we are evil in,
by a divine thrusting on: an admirable evasion
of whoremaster man, to lay his goatish
disposition to the charge of a star! My
father compounded with my mother under the
dragon's tail; and my nativity was under Ursa
major; so that it follows, I am rough and
lecherous. Tut, I should have been that I am,
had the maidenliest star in the firmament
twinkled on my bastardizing.