_Dies Iræ_ (Vol. ii., p. 72.).--I beg to refer MR. SIMPSON to the Rev.
R. C. Trench's _Sacred Latin Poetry Selected_, London, 1849, pp.
270-277. The account of Wadding, historiographer of the Franciscan
Order, is there adopted, who names Thomas of Celano as the author. The
question has been thoroughly discussed by Mohnike, _Hymnologische
Forschungen_, vol. i. pp. 1-24. See also Daniel, _Thesaur. Hymnolog._,
vol. ii. p. 103.