Litany, in Christian worship and some forms of Judaic worship, is a form of prayer used in services and processions, and consisting of a number of petitions. The word comes through Latin litania from Ancient Greek λιτανεία (litaneía), which in turn comes from λιτή (litḗ), meaning "supplication". Christianity Western Christianity This form of prayer finds its model in Psalm 136: "Praise the Lord, for he is good: for his mercy endures for ever. Praise ye the God of gods . . . the Lord of lords . . . Who alone doth great wonders . . . Who made the heavens", etc., with the concluding words in each verse, "for his mercy endures for ever." The Litany originated in Antioch in the fourth century and from there was taken to Constantinople and through it to the rest of the East...From Constantinople the Litany was taken to Rome and the West. Josef Andreas Jungmann explains how the Kyrie in the Roman Mass is best seen as a vestige of a litany at the beginning of the Mass, like that of some Eastern churches. Public Christian devotions became common by the fifth century and processions were frequently held. These processions were called "litanies", and in them pictures and other religious emblems were carried. In Rome, pope and people would go in procession each day, especially in Lent, to a different church, to celebrate the Sacred Mysteries. Thus originated the Roman "Stations", and what was called the "Litania Maior", "Major Rogation", was held on 25 April. The word rogation comes from the Latin verb rogare, meaning "to ask", which reflects the beseeching of God for the appeasement of his anger and for protection from calamities. In 590, when an epidemic caused by an overflow of the Tiber was ravaging Rome, Gregory the Great commanded a litany; on the preceding day he exhorted the people to fervent prayer, and arranged the order to be observed in the procession, during which the Litany of the Saints was prayed. The "Litania Minor", also called Minor Rogations or "Gallicana", the Rogation Days before Ascension, was introduced (477) by St. Mamertus, Bishop of Vienne, on account of the earthquakes and other calamities then prevalent. It was prescribed for the whole of Frankish Gaul, in 511, by the First Council of Orléans. For Rome it was ordered by Leo III, in 799. In the Ambrosian Rite this litany was