Bonedd Gwŷr y Gogledd (English: The Descent of the Men of the North) is a brief Middle Welsh tract which claims to give the pedigrees of twenty 6th century rulers of the Hen Ogledd, the Brittonic-speaking parts of southern Scotland and northern England.
Although certain parts are in agreement with the earlier Harleian genealogies, the text represents a substantial revision seeking to integrate the branches of many rulers and heroes who are prominent in other traditions, such as the Rheged prince Llywarch Hen.
[2] The text consists chiefly of two sections, each of which seeks to trace the lineages of sixth-century rulers to a common ancestor.
The second takes Dyfnwal Hen as its ancestor figure, who is here identified as a grandson of the Roman emperor Magnus Maximus.
The text concludes with a final line on the parentage of Huallu, son of Tudfwlch Cor(n)eu (prince of Cornwall) and Dywanw, daughter of Amlawd Wledic.