These letters and speeches are preserved by Otho bishop of Frisingen (Fabric. Bibliot. Lat. Med. et Infim. tom. v. p. 186, 187), perhaps the noblest of historians: he was son of Leopold marquis of Austria; his mother, Agnes, was daughter of the emperor Henry IV., and he was half- brother and uncle to Conrad III. and Frederic I. He has left, in seven books, a Chronicle of the Times; in two, the Gesta Frederici I., the last of which is inserted in the vith volume of Muratori's historians.