Sir John Morris Jones, the most distinguished pupil of Sir John Rhys, collaborated with the latter in editing a Jesus College manuscript. This work appeared in 1894 in the Medieval and Modem Series of Anecdota Oxoniensia under the title of The Elucidarium and other tracts in Welsh from Llyuyr Agkyr Llandewivrevi, A.D. 1346 (Jesus College Ms. 119) (The Book of the Anchorite of Llanddewifrefi). A note added to the translation of the preface to the Elucidarium says:
Gruffudd ap Llywelyn ap Phylip ap Trahaearn of Cantref Mawr caused this book to be written by the hand of a friend, namely a man who was an anchorite at that time at Llanddewifrefi: whose souls may God hold in His mercy. Amen.
There are seventeen stories in the book, beginning with ‘Hystoria Lucidar’ and ending with ‘Hystoria o uuched beuno ae wyrtheu’ (The story of Beuno's life and of his miracles). One might say that the contents of this book give some idea of the nature of the religious teaching of the Church in Wales in the Middle Ages. Practically all the works included in this book are translations from Latin except for one which is our special interest on this occasion. It is known as ‘Kyssegyrlan Vuched’ or ‘Ymborth yr Eneit’ (The Holy Life or The Food of the Soul) ff. 78v - 92r. It begins on f. 78 with the words ('we now deal with divine love which joins the Creator God and the creature Man ...'). On f 80r there is the sentence ‘and so ends the second part of this book, namely, of Divine Love'.