St David, Bishop and Confessor
Patron of Wales
Statuit ei Dominus testamentum pacis, et principem fecit eum: ut sit illi sacerdotii dignitas in aeternum. * Memento, Domine, David, et omnis mansuetudinis ejus.
The Lord made to him a covenant of peace, and made him a prince: that the dignity of the priesthood should be to him for ever. * O Lord, remember David: and all his meekness.
(Ecclesiasticus 45:30 and Psalm 131:1 from the Introit of Mass)
Grant, we beseech Thee, almighty God, that the loving intercession of blessed David, Thy confessor and bishop, may protect us, and that, while we keep his festival, we may also imitate his steadfastness in defending the Catholic Faith.
Catholic Encyclopaedia: http://www.newadvent.org/cathen/04640b.htm