  Four dimensional N=1 theories are engineered by compactifying six dimensional
(2,0) theory on a Riemann surface with regular punctures. A generalized
Hitchin's equation involving two Higgs fields is proposed as the BPS equation
for N=1 compactification. The puncture is interpreted as the singular boundary
condition of this equation, and regular puncture is shown to be labeled by a
nilpotent commuting pair. In this paper, we focus on a subset of regular
puncture which is described by rotating branes representing N=2 puncture. As an
application, we show that the Seiberg duality of SU(N) SQCD with Nf=2N and
certain superpotential term is realized as different degeneration limits of the
same punctured Riemann surface, and also find four more dual theories.
