(Latin: completorium, complement) The concluding hour of the Divine Office. Its institution in the West is generally ascribed to Saint Benedict of Nursia. Originally it was recited after the evening meal or before retiring; it now follows immediately after Vespers. It includes a short lesson, the Pater Noster, Confiteor, three psalms, little chapter, respond, invariable hymn, and the Canticle of Simeon with its antiphon and collect.