Final answer:
The Old English poem often discussed is 'Beowulf'; the original manuscript's location is unknown. If referring to a known book from Old English times, the Lindisfarne Gospels, containing religious texts and an Old English translation, may be relevant.
Step-by-step explanation:
The Old English poem you might be referring to is likely 'Beowulf', which is the most famous Old English poem, known for its opening lines “Hwæt. We Gardena in geardagum, þeodcyninga, þrym gefrunon, hu ða æþelingas ellen fremedon.” Although the exact book containing the original 'Beowulf' manuscript is not known by a specific title, it is contained in a manuscript referred to as the Nowell Codex.
However, if you are asking about a poem found within a book known from Old English times, the Lindisfarne Gospels may be of relevance. This historical book is known not for containing poems but for its religious texts and the inclusion of an Old English translation by Aldred, which makes it one of the earliest known Gospels written in a form of English.
As per the mentioning of books like the Eadwine Psalter and others in the information provided, while important, these do not contain Old English poems but are rather religious texts and manuscripts from or post the Old English period.
The Lindisfarne Gospels, created to honor God and St. Cuthbert by Bishop Eadfrith, and later inscribed with a translation by Aldred, are a crucial piece of history. These gospels demonstrate the early intersection of Latin religious practice and the English language, preserving a snapshot of the linguistic and cultural landscape of the time.