into a second reading, with a reading about the saint or mystery providing the third, followed by the Te Deum. In lauds and vespers, everything after the psalms is either from the proper or the common of the feast. The same is done at terce, sext, and none. There are very few changes at prime. Compline is of the weekday unless otherwise assigned. Third-class feasts are merely commemorated on weekdays of Lent and are not observed on Sundays. During Advent, they add a commemoration of the ferial day, except on 17–23 December, days classified as second-class ferias that thus outrank them. Before the 1960 Code of Rubrics, saints and mysteries were traditionally ranked as doubles, semidoubles and simples, with doubles further subdivided into first-class doubles, second-class doubles, major doubles and mere doubles. A few years before Pope John XXIII's reform, Pope Pius XII had already abolished semidoubles and Pope Pius X had done away with the tradition that any double feast, of which there were over 200 in the course of the year, outranked a normal Sunday celebration. See also General Roman Calendar References Catholic holy days Roman Rite