It is true that only one trace of a byrnie, and that apparently not of ring-mail, has so far been found in an Anglo-Saxon grave.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers
Other Old English poems, certainly not Scandinavian, mention the ring-byrnie.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers
Helm and byrnie were not necessarily unknown, or even very rare in England, simply because it was not the custom to bury them with the dead.
"Beowulf An Introduction to the Study of the Poem with a Discussion of the Stories of Offa and Finn"
R. W. Chambers