Culhwch identifies her one of the Gold-torqued Women of Britain.
Three Ardent Lovers of the Island of Britain | The Legend of King Arthur
Red Book of Hergest | C. 1425
Text of the Mabinogion and Other Welsh Tales | John Rhys, 1887
Triads of the Island of Britain (Welsh ”Triads”) | 11th century to 14th century
Culhwch and Olwen | Late 11th century