Michael is the Archangel Michael. In Western Christianity since the fifth century, Michael’s Day has been celebrated on September 29. Michael is mentioned in the New Testament of the Bible as an archangel who fights evil. The Evangelical-Lutheran Church celebrates Archangel Michael on the Sunday after September 29. In the Lutheran Church, that day is devoted to all angels. In the Catholic Church, September 29 is a Feast Day for all the Archangels, and on October 2 Catholics observe a memorial for the Holy Guardian Angels.