GWENFREWI Santes, daughter of Brychan, abbess at Gwytherin (MS.); in English, Winifred Saint.  Robert, Prior of Shrewsbury, hath wrote her life, and before him Elerius, Abbot of Gwytherin, as saith Brit. Sanct.  She is said to have lived in the time of King Elwith (qu., who was he?), and was daughter to a British lord, Thewith or Trebwith, who granted Beuno lands to build a church, under whose care she was brought up a nun.  Caradoc, son of Alain, Prince of that country, cut off her head, because she would not consent to lie with him.  Beuno put it on, and brought her to life.  A well (Holywell)—Ffynnon Gwenfrewi—sprung out where her head fell, etc.  In her time Deifer was an anchoret at Botaver (Botvari), and Saturnus at Henthlant (Henllan); and Elerius Abbot of Gwytherin, who buried her, and where St. Kebius and St. Senan were buried, and the Abbess Theonia, after whom Winifred became abbess. (Brit. Sanct.) 
    In the legend of the British Saints we have the life of a lady of this name, called Santes Gwenfrewi; but no author of note mentions any such a woman.  Tudur Aled, the poet, about the year 1450, hath versified her legend as believed in those days.  We have no such name in our ancient British history as Gwenfrewi. (Celtic Remains, Morris-Evans)