The "Sub tuum praesidium" was originally used in an ancient Coptic liturgy As we pray for the success of Pope Francis’ trip to Egypt this weekend, a perfect prayer to use is the oldest known Marian prayer, which in fact, traces back to the pope’s host country.The oldest known Marian prayer is found on an ancient Egyptian papyrus dating from around the year 250. Today known in the Church as the Sub tuum praesidium, the prayer is believed to have been part of the Coptic Vespers liturgy during the Christmas season. Read more: Saint Mark: Father of Coptic Christianity   The original prayer was...