"" (; "the Day of Wrath") is a Latin chant first written by either Thomas of Celano of the Franciscans (1200–c.1265) or Latino Malabranca Orsini (d. 1294), lector at the Dominican "studium" at Santa Sabina, in Rome. It comes from at least the 13th century, but it could be much older. Some have said it was written by St. Gregory the Great (died 604), Bernard of Clairvaux (1090–1153), or Bonaventure (1221–1274).