Bernhiri, duke of Saxe-Weimar, born in Weimar, Aug. 6, 1604, died in Neuburg on the Rhine, July 8, 1639. He joined Gustavus Adolphus in 1631, and after the king's death in the battle of Liitzen took the command and secured the victory. In 1633 he was made commander of half the Swedish army and invested with the dukedom of Franconia, which he lost the next year in consequence of his great defeat by the imperialists at Nordlingen. Not receiving, as he thought, proper support from Sweden, he formed a separate treaty with France at St. Germain-en-Laye, Oct. 17, 1635. In 1636, as commander-in-chief of the French auxiliaries and German troops, he achieved many victories in Lorraine, Burgundy, and Alsace, and in June, 1637, defeated the emperor's troops under Charles, duke of Lorraine. In 1638, cutting loose from the French alliance, he took Brisach, after having defeated three armies sent to its relief, and against the wishes of Richelieu occupied it with German troops. With a view to the establishment of an independent principality in Germany, he had entered into negotiations for a marriage between himself and Amelia, landgravine of Hesse, had continued his conquests in Burgundy, and was projecting the invasion of Bavaria, when he was seized with the disease which put a sudden end to his career, and which he attributed to poison administered by a hireling of Cardinal Richelieu. Upton his death Brisach passed with Alsace into the hands of the French.