In the thirteenth century, the fast of Advent was not commonly practised although, according to Durand of Mende, fasting was still generally observed. As quoted in the bull of canonisation of St. Louis, the zeal with which he observed this fast was no longer a custom observed by Christians of great piety. It was then limited to the period from the feast of Saint Andrew until Christmas Day, since the solemnity of this apostle was more universal than that of St. Martin. When Pope Urban V ascended the papal seat in 1362, he simply forced people in his court to abstinence but there was no question of fasting. It was then customary in Rome to observe five weeks of Advent before Christmas. This is particularly discussed in the Sacramentary of St. Gregory. Ambrosian or Milan Liturgies have six. The Greeks show no more real consistency; Advent was an optional fast that some begin on 15 November, while others begin on 6 December or only a few days before Christmas.