Dies Irae (lit. the Day of Wrath), a Latin hymn on the Last Judgment, so called from first words, and based on Zeph. i. 14-18; it is ascribed to a monk of the name of Thomas de Celano, who died in 1255, and there are several translations of it in English, besides a paraphrastic rendering in the “Lay of the Last Minstrel” by Scott, and it is also the subject of a number of musical compositions.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Dieppe * Diet