# Agnus Dei

Agnus Dei is the Latin name under which the "Lamb of God" is honoured within Christian liturgies descending from the historic Latin liturgical tradition, including those of Roman Catholicism, Lutheranism and Anglicanism. It is the name given to a specific prayer that occurs in these liturgies, and is the name given to the music pieces that accompany the text of this prayer.
The use of the title "Lamb of God" in liturgy is based on John 1:29, in which St. John the Baptist, upon seeing Jesus, proclaims "Behold, the Lamb of God, who takes away the sin of the world!"

## Liturgical usage
### Latin Catholic

The Syrian custom of a chant addressed to the Lamb of God was introduced into the Roman Rite Mass by Pope Sergius I (687–701) in the context of his rejection of the Council of Trullo of 692 (which was well received in the Byzantine East), whose canons had forbidden the iconographic depiction of Christ as a lamb instead of a man.
The verse used in the first and second invocations may be repeated as many times as necessary whilst the celebrant prepares the host and wine for communion.
In a Tridentine Requiem Mass, the words "miserere nobis" are replaced by "dona eis requiem" (grant them rest), while "dona nobis pacem" is replaced by "dona eis requiem sempiternam" (grant them eternal rest). Virtually every Mass setting includes an Agnus Dei
The priest uses the phrase "Lamb of God" again, later in the Mass. While displaying the Eucharistic species to the people before giving them Holy Communion, he says: "Ecce Agnus Dei, ecce qui tollit peccata mundi. Beati qui ad cenam Agni vocati sunt." ("Behold the Lamb of God, behold Him who takes away the sins of the world. Blessed are those called to the supper of the Lamb.")$^{:132}$

### Anglican

The following instances are found in the Church of England's Book of Common Prayer:
From "The Litany":
   O Lamb of God: that takest away the sins of the world; Grant us thy peace. O Lamb of God: that takest away the sins of the world; Have mercy upon us.
From "Holy Communion":
   Lamb of God, Son of the Father, that takest away the sins of the world, have mercy upon us.
The following versions are found in Common Worship, the alternative Anglican liturgical resources, and also in the Episcopal Church's liturgical resources:
   Lamb of God, you take away the sin of the world, have mercy on us. Lamb of God, you take away the sin of the world, have mercy on us. Lamb of God, you take away the sin of the world, grant us peace.
   O Lamb of God, that takest away the sins of the world, have mercy upon us. O Lamb of God, that takest away the sins of the world, have mercy upon us. O Lamb of God, that takest away the sins of the world, grant us thy peace.
   Jesus, Lamb of God, have mercy on us. Jesus, bearer of our sins, have mercy on us. Jesus, redeemer of the world, grant us peace.

### Lutheran

The version found in the Lutheran Service Book of the Lutheran Church–Missouri Synod is:
   Lamb of God, You take away the sin of the world; have mercy on us.
   Lamb of God, You take away the sin of the world; have mercy on us.
   Lamb of God, You take away the sin of the world; grant us Your peace, grant us Your peace.

### Evangelical Protestants

A popular worship song among Evangelical Protestants is a reaction to the Lamb of God being seated on the throne in Revelation 5 by Michael W. Smith. This version is response of praise to scene, while the other liturgical versions are prayers.
The words are
   Alleluia Alleluia For our Lord God Almighty reigns Alleluia Alleluia For our Lord God Almighty reigns Alleluia Holy
   Holy Are You Lord God Almighty Worthy is the Lamb Worthy is the Lamb You are Holy
(Last stanza repeats 3 times)
A Ukrainian translation was sung in 2015 in Lviv, Ukraine, during the War in Donbas at an event organized by Franklin Graham. The song was notably sung again on Easter 2022 in Lviv by a choir of Ukrainian refugees fleeing the Russo-Ukrainian War.

### In popular culture

Outside religious use, the text has been used by composers and groups such as:
* Seigmen for Agnus Dei
* Elliot Goldenthal for Alien 3
* Keiki Kobayashi for Ace Combat 04: Shattered Skies
* Elitsa Alexandrova for Assassin's Creed Rogue
* Enya for the song "Trains and Winter Rains"
* Halsey for the song "Castle"
* Kuroshitsuji (Black Butler) soundtrack for episodes 17 and 18
* Jon Bellion for Ooh
* New Age Worldbeat group Enigma for the song "Agnus Dei"
* Rufus Wainright for the song "Agnus Dei" from the album Want Two
* Mylène Farmer "Agnus Dei" (1991)
* Dream Theater for the song "Bridges in the Sky" from the album A Dramatic Turn of Events
* Paul Ruskay for Homeworld
* Michael W. Smith "Agnus Dei" (1990)
* Britten's War Requiem, in which the text is interleaved with Wilfred Owen's poem "At a Calvary near the Ancre"
* Power metal group Powerwolf for the song Agnus Dei, intro of the album Blood of the Saints.
* Dan Simmons' sci-fi novel Hyperion, inserted as a sentence in the first chapter
* Matt Hylom in the outro for "Unfamiliar Faces" (2021)
* Adam Sporka composed "Agnus Dei" for Kingdom Come: Deliverance (2018). Jan Valta composed "Agnus Dei" for Kingdom Come: Deliverance II (2025).