"Dona nobis pacem" is a song with Latin text, often sung as a canon or round (where each section starts with a new voice). The words, which mean "Grant us peace", come from a portion of the Agnus Dei sung during the Roman Catholic Latin Mass, the Lutheran Divine Service, and the Anglican Eucharist. It is the invocation to the Lamb of God to have mercy and grant peace to the worshipers. It is said to have been introduced into the Mass by Pope Sergius I in 687, and is the last phrase of the Latin form:
Agnus Dei, qui tollis peccata mundi, miserere nobis. Agnus Dei, qui tollis peccata mundi, miserere nobis. Agnus Dei, qui tollis peccata mundi, dona nobis pacem.
The origin of the melody is unknown (most hymnals list it as "traditional").
