a German theologian, was born at Nuremberg, April 2, 1683. He received a careful education; studied law at Altorf and at Halle, was appointed secretary to the duchess of Saxe-Eisenach, afterwards returned to Nuremberg, and abandoned the law to devote himself to the education of the poor. At Helmstaidt he founded a school for poor boys, and another for girls. Eisler was strongly pietistic. He died at Helmstadt, October 8, 1753. For the chief among his numerous works see Hoefer, Nouv. Biog. Generale, s.v.