Which one is not a literary work of “The Old English Period”?

Literary works of the Old English Period:

'Beowulf' (the earliest epic in English),
'The Wanderer',
'The Seafarer',
'The Husband's Message',
'The Anglo-Saxon Chronicle' (the earliest prose of English literature)
are major literary works of the Old English period.

Confessio Amantis is a literary work of The Middle English Period which is written by John Grower.

Source: An ABC of English Literature - Dr M Mofizar Rahman