Prayer to St. Gregory VII

O intrepid defender of the liberty of the Church, illustrious S. Gregory, by that firmness which thou didst manifest, in maintaining her rights against the powers of earth and hell combined against her, stretch forth from heaven, we pray thee, thy powerful arm over her, to comfort and defend her in the fierce warfare which she is today waging. Especially encourage, in the great struggle, the venerated Pontiff who, with thy See, has also inherited the intrepidity of thy heart. Obtain for him that he may see his holy efforts crowned with the triumph of the Church and by the return of the wandering to the right path. Obtain finally that all the world may at last understand that it is vain to struggle against that faith which always has and always will overcome the world–haec est victoria qua vincit mundum fides nostra. Such is the prayer which we pour forth to thee, and we trust that, having answered it in this world, thou wilt one day call us with thee to heaven, near the eternal Pontiff, who with the Father and the Holy Ghost lives and reigns for ever and ever. Amen.
(An Indulgence Of Three Hundred Days, once a day–Pius IX, 1873)
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Prayer to God To Have Saint Gregory the Great as Our Intercessor
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O God, Who didst give blessed Gregory to be a minister of eternal salvation to Thy people: grant, we beseech Thee, that we who have had him on earth as Teacher of life, may be worthy to have him for advocate in heaven. Through our Lord Jesus Christ, Thy Son, Who liveth and reigneth with Thee in the unity of the Holy Ghost, one God, world without end. Amen.
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O eternal Shepherd, watch over the peace of Thy flock, and through blessed Gregory the Great, Sovereign Pontiff, whom Thou didst appoint shepherd over the whole Church, keep her under Thy constant protection. Through our Lord Jesus Christ, Thy Son, Who liveth and reigneth with Thee in the unity of the Holy Ghost, one God, world without end. Amen.