According to Thietmar, Dedo was "of the lineage of the Bukkonen" and a relative of "Markgraf Rikdag". This is repeated in the Annalista Saxo, which says that Dedo Graf von Merseburg and his father Dietrich were from the "tribu que Butzieci dicitur". This family relationship has not been traced.
[Graf im Hassegau]. The Annalista Saxo calls him "Theodericus egregie libertatis vir" and names his two sons. "Otto…rex" confirmed previous grants to Kloster Gandersheim including property "in pago Suththuringa in comitatu Uuillihelmi…[et] in pago Nordthuringa…in comitatu Theoderici in loco…Uuanzleua…[et] in Hliuthirithi in comitatu Irmenfridi" by charter dated 21 Apr 956. "Otto…imperator augustus" donated property "in pagis Derlingon et Nortduringen in comitatu ipsius Mamaconi" to "nostro fideli Mamaconi" at the request of "Theoderici comitis" by charter dated 23 Apr 966.
"Otto…imperator augustus" confirmed donations of property "in Livbedinga in pago Gurketal et in comitatu Ratoldi comitis" by "Theoderici comitis cuidam viduæ Imma" for the foundation of a monastery by charter dated 11 Jun 975, although it is not known whether this refers to the same Graf Dietrich. Thietmar records that Dedo "went so far as to capture his own mother" when leading "the rebellious Bohemians against us at the church of Zeitz". 1
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