Tutagual is thought to have been a ruler of Alt Clut

Kingdom of Strathclyde

Strathclyde , originally Brythonic Ystrad Clud, was one of the early medieval kingdoms of the celtic people called the Britons in the Hen Ogledd, the Brythonic-speaking parts of what is now southern Scotland and northern England. The kingdom developed during the post-Roman period...

 (modern Dumbarton Rock), later known as Strathclyde, a Brythonic

Britons (historical)

The Britons were the Celtic people culturally dominating Great Britain from the Iron Age through the Early Middle Ages. They spoke the Insular Celtic language known as British or Brythonic...

 kingdom in the Hen Ogledd

Hen Ogledd

Yr Hen Ogledd is a Welsh term used by scholars to refer to those parts of what is now northern England and southern Scotland in the years between 500 and the Viking invasions of c. 800, with particular interest in the Brythonic-speaking peoples who lived there.The term is derived from heroic...

or "Old North" of Britain

Great Britain

Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

. He probably ruled sometime in the mid-6th century.

The Harleian genealogies

Harleian genealogies

The Harleian genealogies are a collection of Old Welsh genealogies preserved in British Library, Harleian MS 3859. Part of the Harleian Collection, the manuscript, which also contains the Annales Cambriae and a version of the Historia Brittonum, has been dated to c. 1100, although a date of c.1200...

, Adomnán's Vita Columbae, and the Bonedd Gwŷr y Gogledd

Bonedd Gwŷr y Gogledd

Bonedd Gwŷr y Gogledd is a brief Middle Welsh tract which claims to give the pedigrees of twenty 6th-century rulers of the Hen Ogledd , the Brythonic-speaking parts of southern Scotland and northern England. It is attested in a number of manuscripts, the earliest being NLW, Peniarth MS 45, which...

indicate that Tutagual was the father of the much better known Rhydderch Hael

Riderch I of Alt Clut

Riderch I , commonly known as Riderch or Rhydderch Hael , was a ruler of Alt Clut and the greater region later known as Strathclyde, a Brittonic kingdom that existed on the valley of the River Clyde in Scotland during the British Sub-Roman period...

, presumably his successor. The Harleian genealogies name him as the son of Clinoch

Clinoch of Alt Clut

Clinoch is thought to have been a ruler of Alt Clut , the Brythonic kingdom later known as Strathclyde, some time in the 6th century. The Harleian genealogies name Clinoch as the son of Dumnagual Hen, his probable predecessor as King of Alt Clut, and the father of Tutagual, his probable successor...

 son of Dumnagual Hen

Dumnagual I of Alt Clut

Dumnagual I, also known as Dumnagual Hen , was a ruler of the Brythonic kingdom of Alt Clut , 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"...

, probably his predecessors as king. Tutagual of Alt Clut may be identified with a tyrannical ruler mentioned as Saint Ninian

Saint Ninian

Saint Ninian is a Christian saint first mentioned in the 8th century as being an early missionary among the Pictish peoples of what is now Scotland...

's contemporary in the 8th-century poem Miracula Nyniae Episcopi

Miracula Nyniae Episcopi

The Miracula Nynie Episcopi is an anonymously written 8th-century hagiographic work describing miracles attributed to Saint Ninian. It is considered a non-historical work, and copies are not widely extant....

and in Ailred of Rievaulx

Ailred of Rievaulx

Aelred , also Aelred, Ælred, Æthelred, etc., was an English writer, abbot of Rievaulx , and saint.-Life:...

's 12th-century Vita Sancti Niniani

Vita Sancti Niniani

The Vita Sancti Niniani or simply Vita Niniani is a Latin language Christian hagiography written in northern England in the mid-12th century. Using two earlier Anglo-Latin sources, it was written by Ailred of Rievaulx seemingly at the request of a Bishop of Galloway...

; 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.