O God, You were please to institute
By Heavenly direction through Saint John,
The order of the Holy Trinity,
For redeeming captives from the power of the Saracens*,
Grant, we implore You, that by the suffrage of His merits,
We may be delivered by Your grace from captivity of soul and body. 
Through our Lord Jesus Christ, Your Son, who being God,
Lives and reigns with You in the unity of the same
Holy Spirit, forever and ever.  Amen.

*Saracens - a generic term for Muslims widely used in Europe during the later medieval era