Dumnagual was the name of several kings of Alt Clut, later known as Strathclyde:
Dumnagual I of Alt Clut (c. 6th century) Dumnagual II of Alt Clut (7th century) Dumnagual III of Alt Clut (mid-8th century) Dumnagual IV of Alt Clut (9th century)
See also Dyfnwal (disambiguation)