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For the life and times of Henry the Lion, duke of Saxony, Helmold’s chronicle, as that of a contemporary who had exceptional means for gaining information, is of first-rate importance.

In 1022 it was acquired by the archbishop of Mainz, and in 1103 it came into the possession of Henry the Proud, duke of Saxony, but when his son Henry the Lion was placed under the ban of the Empire, it again came to Mainz.

His attempts to bring peace to Germany were interrupted by the return of Henry the Lion, duke of Saxony, in October 1189, and a campaign against him was followed by a peace made at Fulda in July 1190.

Henry acted energetically in fighting this formidable combination, but his salvation came from the captivity of Richard I., king of England, and the skill with which he used this event to make peace with his foes; and, when Henry the Lion came to terms in March 1194, order was restored to Germany.

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.