See S. Riezler, _Geschichte Bayerns_, Band i. (Gotha, 1878); W. Bernhardi, _Lothar von Supplinburg_ (Leipzig, 1879); W. von Giesebrecht, _Geschichte der deutschen Kaiserzeit_, Band iv. (Brunswick, 1877).
HENRY (1129-1195), surnamed the "Lion," duke of Saxony and Bavaria, only son of Henry the Proud, duke of Saxony and Bavaria, and Gertrude, daughter of the emperor Lothair the Saxon, was born at Ravensburg, and was a member of the family of Welf. In 1138 the German king Conrad III. had sought to deprive Henry the Proud of his duchies, and when the duke died in the following year the interests of his young son were maintained in Saxony by his mother, and his grandmother Richenza, widow of Lothair, and in Bavaria by his uncle, Count Welf VI. This struggle ended in May 1142 when Henry was invested as duke of Saxony at Frankfort, and Bavaria was given to Henry II., Jasomirgott, margrave of Austria, who married his mother Gertrude. In 1147 he married Clementia, daughter of Conrad, duke of Zähringen (d. 1152), and began to take an active part in administering his dukedom and extending its area. He engaged in a successful expedition against the Abotrites, or Obotrites, in 1147, and won a considerable tract of land beyond the Elbe, in which were re-established the bishoprics of Mecklenburg,[1] Oldenburg[2] and Ratzeburg. Hartwig, archbishop of Bremen, wished these sees to be under his authority, but Henry contested this claim, and won the right to invest these bishops himself, a privilege afterwards confirmed by the emperor Frederick I. Henry, meanwhile, had not forgotten Bavaria. In 1147 he made a formal claim on this duchy, and in 1151 sought to take possession, but failing to obtain the aid of his uncle Welf, did not effect his purpose. The situation was changed in his favour when Frederick I., who was anxious to count the duke among his supporters, succeeded Conrad as German king in February 1152. Frederick was unable at first to persuade Henry Jasomirgott to abandon Bavaria, but in June 1154 he recognized the claim of Henry the Lion, who accompanied him on his first Italian campaign and distinguished himself in suppressing a rising at Rome, Henry's formal investiture as duke of Bavaria taking place in September 1156 on the emperor's return to Germany. Henry soon returned to Saxony, where he found full scope for his untiring energy. Adolph II., count of Holstein, was compelled to cede Lübeck to him in 1158; campaigns in 1163 and 1164 beat down further resistance of the Abotrites; and Saxon garrisons were established in the conquered lands. The duke was aided in this work by the alliance of Valdemar I., king of Denmark, and, it is said, by engines of war brought from Italy. During these years he had also helped Frederick I. in his expedition of 1157 against the Poles, and in July 1159 had gone to his assistance in Italy, where he remained for about two years.
