Timeline
- January 2, 1772: Mozart participates in the premiere of Michael Haydn's Requiem in C minor.
- February 14, 1791: Anna, Count von Walsegg's wife, died at the age of 20.
- mid-July: A messenger (probably Franz Anton Leitgeb, the count's steward) arrived with note asking Mozart to write a Requiem Mass.
- mid-July: Commission from Domenico Guardasoni, impresario of the Prague National Theater to compose the opera, La clemenza di Tito, for the festivities surrounding the coronation on September 6 of Leopold II as King of Bohemia.
- August: Mozart works mainly on La clemenza di Tito; completed by September 5.
- August 25: Mozart leaves for Prague.
- September 6: Mozart conducts premiere of La clemenza di Tito.
- mid-September – September 28: Revision and completion of The Magic Flute.
- September 30: Premiere of The Magic Flute.
- October 7: Completed Clarinet Concerto in A major.
- October 8 – November 20: Mozart worked on the Requiem and a cantata.
- November 20: Confined to the bed due to his illness.
- December 5: Mozart died shortly after midnight.
- December 7: Burial in St. Marx Cemetery.
- December 10: Requiem performed in St. Michael for a memorial for Mozart by the staff of the Theater auf der Wieden.
- early March 1792: probably the time Süssmayr finished the Requiem.
- January 2, 1793: Performance of Requiem for Constanze's benefit arranged by Gottfried van Swieten.
- early December 1793: Requiem delivered to the Count.
- December 14, 1793: Requiem performed in the memory of the count's wife in the church at Wiener-Neustadt.
- February 14, 1794: Requiem performed again in Patronat Church Maria Schutz in Semmering
- 1799: Breitkopf & Härtel published the Requiem.
- 1809: Requiem was performed at a memorial service for Joseph Haydn, June 15
- 1833: Eybler suffered stroke while conducting a performance of Mozart's Requiem. He died in 1846.
- December 15, 1840: François Habeneck conducts the Paris Opera in a performance of the Requiem at the reburial of Napoleon I.
- October 30, 1849: Requiem was performed at Frédéric Chopin's funeral.
- January 19, 1964: Requiem was performed as a memorial Mass for President John F. Kennedy by Cardinal Richard Cushing, Archbishop of Boston, at the Cathedral of the Holy Cross in Boston, MA.
- December 5, 1991: Sir Georg Solti conducts the Requiem with the Vienna Philharmonic at St. Stephen's Cathedral in Vienna at a memorial Mass for the dead performed by Cardinal Hans Hermann Gröer for Wolfgang Amadeus Mozart on the bicentenary of his death.
- July 19, 1994: Zubin Mehta conducted Sarajevo Philharmonic Orchestra in the ruins of The Great Counsel Hall in Sarajevo giving an extraordinary concert with participation of José Carreras, Ruggero Raimondi, Cecilia Gasdia and Idiko Komlosi. It was filmed and transmitted by TV to popularise a charity aid for victims of Siege of Sarajevo.
- 1999: Claudio Abbado conducts the Requiem with the Berlin Philharmonic at the Salzburg Cathedral at a memorial concert on the 10th anniversary of the death of Herbert von Karajan.
- 2001: Poznań, Poland, special Tridentine Mass was celebrated during the night of 200th anniversary of Mozart's death, with full usage of the Requiem. Such mass is repeated every year on 4 December.
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