December 17 marks the beginning of the O Antiphons, the seven jewels of our liturgy, dating back to the fourth century, one for each day until Christmas Eve. These antiphons address Christ with seven magnificent Messianic titles, based on the Old Testament prophecies and types of Christ. The Church recalls the variety of the ills of man before the coming of the Redeemer. See O Come! The O Antiphons and Rejoice the Lord is Near! for more information on the O Antiphons by Jennifer Gregory Miller. Build an O Antiphon House with the instructions found here.