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Eugein I was a ruler of Alt Clut, the Brittonic kingdom later known as Strathclyde, sometime in the mid-7th century. According to the Harleian genealogies, he was the son of Beli I, presumably his predecessor as king, and the father of Elfin, who ruled sometime later.[1][2] The Annals of Ulster and the Annals of Tigernach record another probable son, Dumnagual, who ruled Alt Clut and died in 694.[3] Eugein was probably the brother or half brother of Bridei III of the Picts, the victor at the Battle of Dun Nechtain.

The Annals of Ulster record that a Hoan or Oan, King of the Britons, defeated and killed Domnall Brecc of Dál Riata at a place called Srath Caruin (Strathcarron) in 642.[1][4] A stanza interpolated in the poem Y Gododdin, often known as the "Strathcarron interpolation" or simply The Battle of Strathcarron, refers to these events, indicating that the forces of "Nwython's grandson" (i.e., Eugein, the grandson of Neithon of Alt Clut) triumphed over "Dyfnwal Frych" (Domnall Brecc), the ruler of "Pentir" (Kintyre, or Dál Riata).[5] Eugein's date of death is unknown, but he was certainly dead by 658, when another king of Alt Clut, Guret, has his death recorded by the Annals of Ulster.[6] This Guret does not appear in the genealogies; he may have been a brother or son of Eugein.[3]


  1. ^ a b MacQuarrie, p. 9.
  2. ^ Harleian genealogy 5.
  3. ^ a b MacQuarrie, p. 10.
  4. ^ Annals of Ulster, 642.
  5. ^ Clancy, p. 114.
  6. ^ Annals of Ulster, 658.


  • Annals of Ulster, ed. & tr. Seán Mac Airt and Gearóid Mac Niocaill (1983). The Annals of Ulster (to AD 1131). Dublin: DIAS. Lay summaryCELT (2008).
  • Clancy, Thomas Owen (Ed.) (1998). The Triumph Tree: Scotland's Earliest Poetry, 550–1350. Edinburgh: Canonburgh.CS1 maint: Extra text: authors list (link)
  • MacQuarrie, Alan (1993). Edited by A. Grant & K. Stringer. "The Kings of Strathclyde". Medieval Scotland: Crown, Lordship and Community. Edinburgh University Press: 1–19.
Regnal titles
Preceded by
King of Alt Clut
fl. 642
Succeeded by