St William of York, Bishop and Confessor
Sacerdotes tui, Domine, induant justitiam, et sancti tui exsultent: propter David servum tuum, non avertas faciem Christi tui. * Memento, Domine, David et omnis mansuetudinis ejus.
Let Thy priests, O Lord, be clothed with justice, and let Thy saints rejoice: for thy servant David's sake, turn not away the face of Thy anointed. * O Lord, remember David and all his meekness.
(Psalm 131:9-10,1 from the Introit of Mass)
O God, who dost gladden us by the merits and intercession of blessed William, Thy confessor and bishop; mercifully grant that we who ask his favours may gain them by the gift of thy grace.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/15628c.htm