Teneu
legendary Christian saint who was venerated in medieval Glasgow, Scotland
Feast: 18 July (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
Teneu (or Thenew (Latin: Theneva), 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"). She is commemorated annually on 18 July.
Summary from Wikipedia (CC BY-SA 4.0), until this page is written up in full.
The miracles
Limited information available on this saint.
Why that counted as sanctity
Limited information available on this saint.