He left fewer than 20 paintings and his history is mysterious, but we do know that Bartolomé Bermejo was born in Cordoba, Spain, and led an unsettled life. His astonishing technical virtuosity—jeweled color, delicacy in detail—ranks him with the Flemish masters. Britain’s newly restored Bermejo—Saint Michael Triumphs Over the Devil—is presented along with six Bermejos never before seen in the U.K. Feast your eyes on St. Michael’s ruby-red cape and rainbow wings. —L.J.