According to Wegener, Berthold was the son of Arnulf Duke of Bavaria [Luitpoldinger] although he cites no primary source to support this. From a chronological point of view, this seems unlikely. The children of Duke Arnulf must have been born between [910] and [930], which appears incompatible with Markgraf Berthold's only known marriage in [970]. According to Europäische Stammtafeln, Berthold was the possible son of Graf Heinrich [alte Babenberger] and brother of Heinrich Archbishop of Trier.
Graf im Radenzgau 960: "Otto…rex" donated property "in pago Ratinzgouue in comitatu Berchtoldi" held by "Diotmarus…soror ipsius…Gerbirg" to Kloster Drübeck by charter dated 10 Sep 960. Graf an der unteren Naab 961. Graf im Nordgau 961: "Otto…rex" donated property "hereditatis nobilis vir Diotmar…in loco Priemperch…in pago Nortgouue in comitatu Bertoldi comitis" to Regensburg St Emmeram by charter dated 4 Feb 961. "Otto…imperator augustus" granted property "Emmele et Winteriche in pago Muselgowe in comitatu Bertholdi comitis" to Kloster St Maximin, Trier by charter dated 8 Jan 966. Graf im Volkfeld 973. Markgraf 976. Graf des Östlichen Franken 980.
The necrology of Fulda records the death in 980 of "Berahtolt com". 1
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