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. It is traditionally ascribed to the bard Aneirin and survives only in one manuscript, the Book of Aneirin.
Clinoch of Alt Clut Clinoch (Welsh: "Clynog" ) is thought to have been a ruler of Alt Clut, the Brittonic kingdom later known as Strathclyde, some time in the 6th century. The Harleian genealogies name Clinoch as the son of Dumnagual Hen, his probable predecessor as King of Alt Clut, and the father of Tutagual, his probable successor. The "Bonedd Gwŷr y Gogledd", a later genealogy of rulers in the "Hen Ogledd" or "Old North" of Britain, names the descendant between Dumnagual and Tutagual Kedic.