"DIES IRÆ, DIES ILLA."

In reply to the first of Mr. SIMPSON's Queries (Vol. ii., p. 72.) relative to the magnificent sequence *Dies iræ*, I beg to say that the author of it is utterly unknown. The following references may be sufficient:—Card. Bona, *Rer. Liturgic.* lib. ii. cap. vi. p. 336., Romæ, 1671; or, if possible, Sala's edition, tom. iii. p 143., Aug. Turin. 1753; Gavantus, tom. i. pp. 274-5., Lugd. 1664; and the *Additions* by Merati, i. 117-18., Aug. Vindel, 1740; Zaccaria, *Biblioth. Ritual.* tom. i. p. 34., Romæ, 1776; Oldoini Addit. ad Ciaconii *Vit. Pontiff. et Cardd.*, tom. ii. col. 222., Romæ, 1677. M…