Abstract
We propose a number of new Seiberg dualities of 
= 1 quiver gauge theories.
The new Seiberg dualities originate in new S-dualities of = 2 superconformal field theories
recently proposed by Gaiotto.
= 2 S-dual theories deformed by suitable mass terms flow to our = 1 Seiberg dual theories.
We show that the number of exactly marginal operators is universal for these Seiberg dual theories
and the 't Hooft anomaly matching holds for these theories.
These provide strong evidence for the new Seiberg dualities.
Furthermore, we study in detail the Klebanov-Witten type theory and its dual as a concrete example.
We show that chiral operators and their non-linear relations match between these theories.
These arguments also give non-trivial consistency checks for our proposal.
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