Question: 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?
{'answer': 'Book of Aneirin', 'supporting_facts': [['Y Gododdin', 0], ['Y Gododdin', 1], ['Battle of Catraeth', 0]]}