Dumnagual I of Alt Clut

Dumnagual I, also known as Dumnagual Hen ("the Old"; Welsh: Dyfnwal Hen), was a ruler of the Brythonic kingdom of Alt Clut (modern Dumbarton Rock), later known as Strathclyde, probably sometime in the early 6th century. His biography is vague, but he was regarded as an important ancestor figure for several kingly lines in the Hen Ogledd or "Old North" of Britain. As an ancestor figure, he compares to Coel Hen, another obscure figure credited with founding a number of northern dynasties.

According to the Harleian genealogies, Dumnagual was the son of a Cinuit, the son of Ceretic Guletic, probably his predecessors as king.^[1] The Harleian genealogies name three of his sons, each of whom formed a kingly line. These are Clinoch, Dumnagual's successor as king of Alt Clut; Guipno (Gwyddno), who fathered the later king Neithon; and Cynfelyn, a king of Din Eidyn or Edinburgh.^[2] The Bonedd Gwŷr y Gogledd, a later genealogy of northern kings, gives a modified version of Dumnagual's family tree.^[3] Here, he is the son of Idnyued and the grandson of Maxen Wledig, better known as the Roman usurper Magnus Maximus. The Bonedd follows the Harleian in making Dumnagual the great-grandfather of Rhydderch Hael, a later king of Alt Clut, but his other descendants are altered significantly.^[2] A Gwyddno is included, but he listed as Dumnagual's great-grandson rather than son, and he is specifically identified as Gwyddno Garanhir of the Taliesin legend.^[3] A highly confused track makes Dumnagual the ancestor to the family of Áedán mac Gabráin, a 6th-century ruler of the Gaelic kingdom of Dál Riata.^[3]

Notes

1. ^ Harleian genealogy 5
2. ^ ^{a b} MacQuarrie, p. 5.
3. ^ ^{a b c} Bromwich, pp. 256–257.

References

• Bromwich, Rachel (2006). Trioedd Ynys Prydein: The Triads of the Island of Britain. University of Wales Press. ISBN 0-7083-1386-8. 
• MacQuarrie, Alan; A. Grant & K. Stringer (Eds.) (1993). "The Kings of Strathclyde". Medieval Scotland: Crown, Lordship and Community (Edinburgh University Press): 1–19. 

Regnal titles
Preceded by Cinuit?	King of Alt Clut early-6th century?	Succeeded by Clinoch