Aethelweardus, Fabius. [Letter to Matilda, abbess of Essen, undated (3)] in Chronicon AEthelweardi/ The Chronicle of AEthelweard 33

[Letter from Fabius Aethelweard to Matilda, abbess of Essen]
Prologue to the fourth book of his Chronicle and an apology for sending so much reading.
Online at Epistolae (See also Bibliographia record).