The Chronico Eberspergensi Posteriore names "Eberhardum et Adalperonen" as the two sons of "Ratoldus [Sighardi filius]" & his wife. "Otto…rex" granted property "in comitatu Adelberonis in loco Izhzelinga" to "fratris nostri Heinrici cuidam suo vasallo Marquart" by charter dated 23 Sep 951.
The Chronico Eberspergensi Posteriore records the death "die Prothi et Iacincti martyrum" of "Adelperum" and his burial with his wife at Freising. The necrology of Ebersberg records the death "III Id Sep" of "Adalpero com pater Odalrici". The necrology of Freising Cathedral records the death "IV Id Sep" of "Adalpero com". 1
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