What manuscript survived the medieval Welsh poem consisting of a series of elegies to the men of the Brittonic kingdom of Godddin,  who fought a battle around AD 600 between a force raised by the Gododdin, a Brythonic people of the "Hen Ogledd" or "Old North" of Britain, and the Angles of Bernicia and Deira?
Y Gododdin: Y Gododdin (] ) is a medieval Welsh poem consisting of a series of elegies to the men of the Brittonic kingdom of Gododdin and its allies who, according to the conventional interpretation, died fighting the Angles of Deira and Bernicia at a place named "Catraeth" in c. AD 600. Y Gododdin:  It is traditionally ascribed to the bard Aneirin and survives only in one manuscript, the Book of Aneirin.
i don't know