... in the eastern church a feast day was established in the ninth month of the year to commemorate the archangels and other heavenly bodies because there are nine ranks of angels. Today is that feast.
ARCHANGELS (1 Thess 4:16) are messengers of great and wondrous tidings. They reveal prophecies and the mysteries of the faith. They enlighten people to know and understand the will of God, they spread faith in God among the people, illuminating their minds with the light of the Holy Gospel... and, as my son likes to say, they kill the devil!
Gerard David, Altar of Archangel Michael