Poems attributed to Siôn Trefor are found in Gwysaney MS. 25; Llanstephan MS 11 ; Pen. MSS. 84, 86, 313; N.L.W. MSS. 1553, 6471; and to Sir Siôn Trefor in Jes. Coll. MS. 15. An englyn to Sir Hugh, earl of Worcester, composed by Sir John Trefor and Edmund Prys, appears in N.L.W. MS. 11993.
Published date: 1959
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