Saint Michael's Lent is a period of fasting observed as a private devotion by some members of the Catholic Church, from the Feast of the Assumption on August 15 to Michaelmas (the feast of St Michael) on September 29, excluding Sundays. [1] According to Bonaventure, St. Michael's Lent originates in Franciscan tradition. [2] It is also mentioned in Little Flowers of St. Francis . [3] It was the custom for Francis of Assisi to fast before Michaelmas to honor the Blessed Virgin and St. Michael. [4]