Widukind of Corvey. [Letter to Matilda, abbess of Quedlinburg, undated] in Quellen zur Geschichte der sächsischen Kaiserzeit. Widukinds Sachsengeschichte, Adalberts Fortsetzung der Chronik Reginos, Liudprands Werke.

[Letter from Widukind of Corvey to Matilda, abbess of Quedlinburg]
The dedicatory preface from book one of Widukind's Rerum gestarum Saxonicarum.
Online at Epistolae (See also Bibliographia record).