Northern Brythonic saints

Saint Patrick was a fifth-century Romano-British Christian missionary and bishop in Ireland. Known as the "Apostle of Ireland", he is the primary patron saint of Ireland, the other patron saints being Brigid of Kildare and Columba. He is also the patron saint of Nigeria. Patrick is venerated as a saint in the Catholic Church, the Church of Ireland, Lutheranism, and in the Eastern Orthodox Church, where he is regarded as equal-to-the-apostles and Enlightener of Ireland.

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.

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. For this reason, he is known as the Apostle to the Southern Picts, and there are numerous dedications to him in those parts of Scotland with a Pictish heritage, throughout the Scottish Lowlands, and in parts of Northern England with a Northumbrian heritage. He is also known as Ringan in Scotland, and as Trynnian in Northern England.

apostle of the British Kingdom of Strathclyde in the late 6th century

Teneu (or Thenew (), Tannoch, Thaney, Thanea, Denw, etc.) is a legendary Christian saint who was venerated in medieval Glasgow, Scotland. Traditionally she was a sixth-century Brittonic princess of the ancient kingdom of Gododdin (in what became Lothian) and the mother of Saint Mungo, apostle to the Britons of Strathclyde and founder of the city of Glas Ghu (Glasgow). She and her son are regarded as the city's co-patrons, and Glasgow's St Enoch Square allegedly marks the site of a medieval chapel dedicated to her, built on or near her grave ("St. Enoch" is in fact a corruption of "St. Teneu").

Scottish saint

5th century British saint

king in sub-Roman Britain