According to the Res gestae saxonicae by the chronicler Widukind of Corvey, Matilda's father, the Westphalian count Dietrich, was a descendant of dux Widukind.
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The details of Saint Matilda's life come largely from brief mentions in the Res gestae saxonicae of the monastic historian Widukind of Corvey (c. 925 – 973), and from two sacred biographies (the vita antiquior and vita posterior) written, respectively, circa 974 and circa 1003.