As I mentioned in the Death Chat a few nights ago, I can't recommend this version of Beowolf highly enough...
http://tinyurl.com/2updalBeowolf in an epic poem composed in Anglo-Saxon. The Heaney translation linked above contains the OE text as well as a verse translation into modern English.
Summary: Beowolf was a Hero (later king) in southern Sweeden. He travels to Denmark to save the Danes from Grendel and his mother. 50 years later he perishes in mortal combat with a wyrm (dragon) in his homeland. The text was put down on paper between 650 and 1000 CE by a Christian poet - making it the first narative in proto-English - so I'm not sure what versions are referenced as having been changed by monks.
Get the book, you won't be sorry.