From Dom Guéranger's The Liturgical Year.
While Apollinaris adorns holy Mother Church with the bright purple of his martyrdom, another noble son crowns her brow with the white wreath of a confessor pontiff. Liborius, the heir of Julian, Thuribius, and Pavasius, was a brilliant link in the glorious chain connecting the church of Le Mans with Clement, the successor of St. Peter; he came to bring peace after the storm, and to restore to the earth a hundredfold fruitfulness after the ruin caused by the tempest. The fanatical disciples of Odin, invading the west of Gaul, had committed more havoc in this part of our Lord’s vineyard than had the proconsuls with their cold legalism, or the ancient Druids with their fierce hatred. Liborius, defender of the earthly fatherland, and guide of souls to the heavenly one, brought the enemy to be citizen of both by making him Christian. As a pontiff, he laboured with purest zeal for the magnificence of divine worship, which renders homage to God, and gives health to the earth; as apostle, he took up again the work of evangelization begun by the first messengers of the faith, driving idolatry from the strongholds it had reconquered, and from the country parts, where it had always reigned supreme: his friend St. Martin had not in this respect a more worthy rival.
Five centuries after the close of his laborious life his blessed body was removed from the sanctuary where it lay among his fellow-bishops, and scattering miracles all along the way, was carried to Paderborn; pagan barbarism once more fled at the approach of Liborius, and Westphalia was won to Christ. Le Mans and Paderborn, uniting in the veneration of their common apostle, have thus sealed a friendship which a thousand years have not destroyed.
Prayer
Da, quæsumus omnipotens Deus, ut beati Liborii, confessons tui atque pontificis, veneranda solemnitas et devotionem nobis augeat, et salutem. Per Dominum.
Grant, we beseech thee, O almighty God, that the venerable solemnity of blessed Liborius, Thy confessor and bishop, may contribute to the increase of our devotion, and promote our salvation. Through our Lord, etc.