Ernst I., Duke of Saxe-Gotha and Altenburg; served in the Thirty Years' War under Gustavus Adolphus, and shared in the victory of Lützen; was an able and wise ruler, and gained for himself the surname of “the Pious” (1601‒1675).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Ernst, Elector of Saxony * Eros