- NLW MS 8062A
-  x 
Part of Isaac Williams Manuscripts
One of two volumes containing transcripts by Isaac Williams of three anthems, one on the 24th psalm by John Williams, Dolgellau, 'Teilwng yw'r Oen', music by James Hawkins, organist at Ely Cathedral, 1682-1729, and words by James Hughes ('Iago Trichrug'), and 'I bwy y perthyn mawl?'.