When Hermannus saw death approaching, he entrusted to Berthold all the wax tablets that contained the writings which he had not yet committed to parchment and commissioned Berthold to peruse them and, after careful revision, to copy them on parchment.
Berthold was also exhorted by his dying master to continue the chronicle, begun by Hermann, which in chronological order related the history of the world from the birth of Christ to 1054, the year in which Hermann died.
Bernold remarks in his chronicle under the year 1088 that Berthold, an excellent teacher who was very well versed in Holy Scripture, died at an advanced age on 12 March.
It is reprinted to the year 1080, with an introduction by Pertz, in Monumenta Germaniae Historica: Scriptores V, 264–326, and in Patrologia Latina, CXLVII, 314–442.
[1] From various passages in Berthold's chronicle it appears that, for a short time at least, he considered Cadalus, Bishop of Parma, as the legitimate occupant of the papal throne; but from the year 1070, or even earlier, he acknowledged Pope Alexander II as the true pope.