Manegold's book also contained an account of the life of Gregory VII, reflecting the Vita by John the Deacon of Gregory the Great; this shares details with chronicles of Berthold of Reichenau and Bernold of St Blasien, writing in the part of southern Germany in which Manegold had sheltered after having to leave Alsace.
According to the medieval chronicler Berthold of Reichenau, the nobleman Burkhard I, Count of Zollern (de Zolorin) was born before 1025 and died in 1061.
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