Symmetry enhancement in 4d Spin(n) gauge theories and compactification from 6d

We consider a known sequence of dualities involving 4d N = 1 theories with Spin(n) gauge groups and use it to construct a new sequence of models exhibiting IR symmetry enhancement. Then, motivated by the observed pattern of IR symmetries we conjecture six-dimensional theories the compactification of which on a Riemann surface yields the 4d sequence of models along with their symmetry enhancements, and put them to several consistency checks.