O God, who hast not without reason mingled the birthday of the glorious high-priest, Thomas, with the joys of thy nativity, by the intervention of his merits, make these thy servants venerate thy majesty with the reverence of due honour. Amen. And as he, according to the rule of a good shepherd, gave his life for his sheep, so grant thou to thy faithful ones, to fear no tyrannical madness to the prejudice of Catholic truth. Amen. We ask that they, by his example, for obedience to the holy laws, may learn to despise persons, and by suffering manfully to triumph over tyrannical madness. Amen.
— Prayer for the Feast of St. Thomas Becket, listed under the heading “Proper Benedictions for the Circuit of the Year,” from a pontifical of Anianus, Bishop of Bangor (1268).