He received his education at the Benedictine monastery of Niederaltaich, where he afterwards made his vows and was appointed custodian of the church.
Under Abbot Ditmar (1232–42) he was sent on important missions concerning the interests of the monastery, first to the emperor in Verona, then to the Roman Curia in 1239 and again in 1240.
On 12 March 1273, he resigned his office on account of ill-health and old age, and spent the remaining two years of his life in retirement at his monastery.
Up to 1146 they are based on previous chronicles; but from 1146 to 1173 they are the independent work of Hermann and are a useful historical source regarding Bavaria, Bohemia, and Austria.
Hist., XVII, 351- 427, German translation by Weiland in Geschichtschreiber der deutschen Vorzeit (Berlin, 1871; second edition, Leipzig, 1898).