Engarandus Juvenis

Engarandus Juvenis, "Enguerrand the Younger" (fl. 1480s–90s) is a composer, presumed to be of French origin, whose three known works are all preserved in a single codex – the Codice di Staffarda – in the Cistercian monastery of Staffarda, Italy. He is notable as the composer of the earliest surviving example of a polyphonic setting of a Requiem mass complete with Dies Irae section. Provided by Wikipedia