The mother of "Thietrici comitis" is named "abbatissa Mahthild" in the Vita Mathildis Reginæ, which specifies that she was abbess at Herford. The name of the husband of Mathilde is not known but, if the chronicler Widukind is to be believed, he was a descendant of Duke Widukind. This appears corroborated by the transmission of the name Widukind to his grandson. If this is correct, from a chronological point of view it is likely that [Theodoric] was the great-grandson of Widukind.
Widukind names "Thiadrici" as father of Queen Mathilde, specifying that the family was "stirpis magni ducis Widukindi". The father of Queen Mathilde is named "Thietricus" in the Vita Mathildis Reginæ. 1
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