London, British Library, Cotton Vespasian A. xiv, fols. 114-79 (?York, s.xi\1)
Comment:
The source is among the collection of Alcuin letters included in a Wulfstan 'Commonplace Book' manuscript, London, British Library, Cotton Vespasian A. 14. Cross and Brown 1989, 290 n.25, point out that the extract from this letter which appears in another manuscript could equally well have been the source for lines 176-86.