Editing Dies irae (section)

===Manuscript sources===
The text of the sequence is found, with slight verbal variations, in a 13th-century manuscript in the [[Biblioteca Nazionale Vittorio Emanuele III]] at Naples. It is a [[Franciscan]] calendar missal that must date between 1253 and 1255 for it does not contain the name of [[Clare of Assisi]], who was canonized in 1255, and whose name would have been inserted if the manuscript were of later date.