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Dies Iræ is a famous Latin hymn written by Thomas of Celaeno. It is often judged to be the best medieval Latin poem, differing from classical Latin by its accentual (non-quantitative) stress, and its rhymed lines. The meter is trochaic. The poem describes the day of judgment, the last trumpet summoning souls before the throne of God, where the good will be delivered and the evil will be cast into eternal flames.
The text:
'Day of Wrath! Upon that day, the world will melt in the twinkling of an eye, as David prophesied and the Sibyl!'
'What trembling is to come, when the Judge appears, to judge all strictly.'
'The trumpet, casting a wondrous sound through the tombs of all nations, compels all before the Throne.'
'Death and Nature shall be astounded, when creation rises again to respond to its judge.'
'The book shall be brought forth, in which all is written, whence the world will be judged.'
'So when the Judge shall sit, all that has been hidden shall be brought to light, and no wrong shall remain unpunished.'
'What then can I in my weakness say? What patron shall I call upon, when even the righteous will be in jeopardy?'
'King of awesome majesty, who saves the chosen for free, save me, O fountain of grace[1]'.
'Remember, sweet Jesus, that I am the cause of your journey; let me not be lost in that day.'
'Seeking me, you sat exhausted; you redeemed me by suffering on the Cross; such work should not be in vain.'
'Just judge of vengeance, grant me the gift of forgiveness before the day of reckoning'.
'I sigh, like a guilty person; my sin reddens my face; spare your supplicant, O God'.
'You who forgave Mary (Magdalene), and heard the plea of the thief (Dismas), have also given me some hope.'
'My prayers are unworthy; but you, the Good, show me favour, lest I be burnt up in eternal fire.'
'Prepare me a place among the sheep, and keep me from the goats, standing at your right hand.'
'When you have confounded the accursed ones, and cast them into harsh flames, call me among the blessed ones.'
'I pray humbly on my knees, my contrite heart like ashes, take care of me at the end.'
The poem appears complete as it stands at this point. Some scholars question whether the remainder is an addition made in order to suit the great poem for liturgical use, for the last stanzas discard the consistent scheme of triple rhymes in favor of rhymed couplets, while the last two lines abandom rhyme for assonance and are, moreover, catalectic:
'That day will be full of tears, when from the grave, guilty mankind rises to be judged. Therefore, have mercy upon me, O God; sweet Lord Jesus, grant them eternal rest. Amen'.
[1] fons pietatis is sometimes translated 'fount of piety.'
The inspiration of the hymn seems to have come from the Vulgate translation of Zephaniah I:15-16:
The oldest text of the sequence is found, with slight verbal variations, in a 13th century manuscript in the Biblioteca Nazionale at Naples. It is a Franciscan calendar missal that must date between 1253 - 1255 for it does not contain the name of Saint Clare, who was canonized in 1255, and whose name would have been inserted if the manuscript were of later date.
The hymn, set to a sombre Gregorian chant, was a part of the Roman Catholic Requiem service, the Mass for the dead. It also forms part of the liturgy of All Souls Day. The words have been set to music by many composers, usually as part of a requiem, of whom Wolfgang Amadeus Mozart, Giuseppe Verdi, and Hector Berlioz's versions are the most frequently performed.
The traditional Gregorian chant melody associated with the dies irae has also been quoted in a number of classical pieces, among them Berlioz's Symphonie Fantastique, Franz Liszt's Totentanz, and several pieces by Sergei Rachmaninoff, including Rhapsody on a Theme of Paganini, The Isle of the Dead and the finale of his final large work, the Opus 45 Symphonic Dances.
Stanley Kubrick's The Shining opens with a synthesized version of the Symphonie Fantastique version of the Dies Irae, as arranged by Wendy Carlos.
The hymn was used as a sequence in the Roman Catholic Requiem service until the Missal of Paul VI, released in 1972. (It is still permitted as an optional sequence at that Mass. The hymn is suggested in the current Latin Breviary (Editio Typica Altera, from 2000) for use in the Liturgy of the Hours during the last week of Ordinary Time, leading up to the feast of Christ the King.