Verdi's Requiem was first performed at San Marco in Milan on the first anniversary of Manzoni's death.

The Messa da Requiem is a musical setting of the Catholic funeral mass (Requiem) for four soloists, double choir and orchestra by Giuseppe Verdi. It was composed in memory of Alessandro Manzoni, whom Verdi admired, and therefore also referred to as the Manzoni Requiem. The first performance, at the San Marco church in Milan on 22 May 1874, conducted by the composer, marked the first anniversary of Manzoni's death. It was followed three days later by the same performers at La Scala. Verdi conducted his work at major venues in Europe.

San Marco is a church in Milan, northern Italy.

Alessandro Francesco Tommaso Antonio Manzoni was an Italian poet, novelist and philosopher.

May 22 is the 142nd day of the year in the Gregorian calendar; 223 days remain until the end of the year.