Tutagual of Alt Clut

Tutagual (Welsh: Tudwal) is thought to have been a ruler of Alt Clut, later known as Strathclyde, a Brittonic kingdom in the Hen Ogledd or "Old North" of Britain. He probably ruled sometime in the mid-6th century.
The Harleian genealogies, Adomnán's Vita Columbae, and the Bonedd Gwŷr y Gogledd indicate that Tutagual was the father of the much better known Rhydderch Hael, presumably his successor. The Harleian genealogies name Tutagual as the son of Clinoch son of Dumnagual Hen, probably his predecessors as king. Tutagual of Alt Clut may be identified with a tyrannical ruler mentioned as Saint Ninian's contemporary in the 8th-century poem Miracula Nyniae Episcopi and in Ailred of Rievaulx's 12th-century Vita Sancti Niniani; the Miracula calls this king Tuduael and Thuuahel, while Ailred gives the forms Tudwaldus and Tuduvallus. However, historian Alan MacQuarrie notes that this would conflict with other suggested dates for Ninian's life.