Ustig is a 6th-century

Pre-Congregational Saint In the Catholic Church, the Dicastery for the Causes of Saints, previously named the Congregation for the Causes of Saints (), is the dicastery of the Roman Curia that oversees the complex process that leads to the canonization of saints, passi ...

of Wales. He was a child of King Caw of Strathclyde, and according to Frederick Holweck, the brother of Aldate, bishop of Gloucester.Holweck, Frederick George. ''A Biographical Dictionary of the Saints: With a General Introduction on Hagiology''
United Kingdom, B. Herder Book Company, 1924. p. 1001 He appears as "Iustic" in the tale ''

Culhwch and Olwen ''Culhwch and Olwen'' () is a Welsh tale that survives in only two manuscripts about a hero connected with Arthur and his warriors: a complete version in the Red Book of Hergest, , and a fragmented version in the White Book of Rhydderch, . It ...

''.Baring-Gould, Sabine. ''The Lives of the British Saints'', Vol. 4, C. J. Clark, 1913, p. 348
/ref> Baring-Gould mentions another Ustig, descended from

Cadell Ddyrnllwg Cadell Ddyrnllwg (Welsh for 'Cadell of the Gleaming Hilt'; born c. AD 430) was a mid-5th century King of Powys. Much of what is known of him involves a heavily-mythologized account of his rise to power thanks to divine intervention. Biography A ...

, who was a confessor, along with

Dyfrig Dubricius or Dubric (; Norman-French: ''Devereux''; c. 465 – c. 550) was a 6th-century British ecclesiastic venerated as a saint. He was the evangelist of Ergyng () (later Archenfield, Herefordshire) and much of south-east Wales. B ...

and Eldad, at ''Cor Garmon'' at

Llancarfan Llancarfan is a rural village and community in the Vale of Glamorgan, Wales. The village, located west of Barry and near Cowbridge, has a well-known parish church, the site of Saint Cadoc's 6th-century clas, famed for its learning. Cainnech ...

References

{{authority control Welsh Roman Catholic saints 6th-century Christian saints