6th-century Welsh people

Gildas (English pronunciation: , Breton: Gweltaz; ) – also known as , (in Middle Welsh texts and antiquarian works) and (Gildas the Wise) – was a 6th-century British monk best known for his religious polemic , which recounts the history of the Britons before and during the coming of the Saxons. He is one of the best-documented figures of the Christian church in the British Isles during the sub-Roman period, and was renowned for his Biblical knowledge and literary style. In his later life, he emigrated to Brittany, where he founded a monastery known as Saint-Gildas-de-Rhuys.

Saint Carannog (Old Welsh:Carantog; ; ; , also anglicised as Carantoc or Carantock) was a 6th-century Welsh saint, abbot and confessor. He is the founder of the Llan at Llangrannog in Ceredigion, Wales, as well as other monastic sites across Somerset, Cornwall, Brittany and Ireland.

Welsh saint; mother of St David

5c Welsh saint

King of the Northern Pennines

Saint Gwladys ferch Brychan () or St Gladys (), daughter of King Brychan of Brycheiniog, was the queen of the saint-king Gwynllyw Milwr and the mother of Cadoc "the Wise", whose Vita may be the earliest saint's life to mention Arthur. Gwladys's other children were Cynidr, Bugi, Cyfyw, Maches, Glywys II and Egwine. Today her main church and associated school is in Bargoed.

Cuneglasus (fl. 540) was a prince of Rhos in Gwynedd, Wales, in the late 5th or early 6th century. He was castigated for various sins by Gildas in De Excidio Britanniae. The Welsh form Cynlas Goch is attested in several genealogies of the Rhos royal line. The two names are assumed to refer to the same ruler.

thumb|left|St. Wenappa's Church, Gwennap

King of Ergyng

King Cynfyn (; died c. 615) was the King of Ergyng, a kingdom of south-east Wales in the early medieval period. He was the son of Peibio Clafrog.

Baruc ( ; also known as Barruc, Barrog or Barry) was a 6th-century Welsh saint.

Mabyn, also known as Mabena, Mabon, etc., was a medieval Cornish saint. According to local Cornish tradition she was one of the many children of Brychan, king of Brycheiniog in Wales in the 5th century. The village and civil parish of St Mabyn is named for her, and the local St Mabyn Parish Church is dedicated to her.