The Celebration of the Sobor [Assemblage] of the Leader of the Heavenly Hosts Michael, and the Other Heavenly Bodiless Hosts was established at the beginning of the IV Century at the local Laodician Council, which occurred several years before the First Ecumenical Council. The Laodician Council by its 35th Canon condemned and renounced as heretical the worship of angels as creators and rulers of the world and it affirmed their proper Orthodox veneration. A feastday was established in November -- the ninth month from March (with which month the year began in ancient times) -- in accordance with the 9 Ranks of Angels. The eighth day of the month was decreed for the intended Sobor [Assemblage] of all the Heavenly Powers -- in conjunction with the Day of the Dread Last-Judgement of God, which the holy fathers called the "Eighth Day" -- since after this age in which the seven days [of Creation] have elapsed will come the "Eighth Day" -- and then "shalt come the Son of Man in His Glory and all the holy Angels together with Him" (Mt 25:31).
The Angelic Ranks are divided into three Hierarchies: highest, middle, and lowest. In the Highest Hierarchy are included the three Ranks: the Seraphim, Cherubim and Thrones. Closest of all to the MostHoly Trinity stand the six-winged Seraphim [Seraphimy] (Flaming, and Fiery) (Is 6:12). They blaze with love for God and impel others to it.
After the Seraphim there stand before the Lord the many-eyed Cherubim [Cheruvimy] (Gen 3:24). Their name means: outpouring of wisdom, enlightenment, since through them -- radiating with the light of Divine-knowledge and understanding of the mysteries of God, there is sent down wisdom and enlightenment for true Divine-knowledge.
After the Cherubim, stand God-bearing through grace given them for their service, the Thrones [Prestoly] (Col 1:16), mysteriously and incomprehensibly upholding God. They serve the uprightness of God's justice.
The Middle Angelic Hierarchy consists of three Ranks: Dominions, Powers, and Authorities:
In the Lowest Hierarchy are included the three Ranks: Principalities, Archangels, and Angels:
All the Ranks of the Heavenly Powers have in common the name Angels -- by virtue of their service. The Lord reveals His will to the highest of the Angels, and they in turn inform the others.
Over all the Nine Ranks, the Lord put the Holy Leader ["Archistrategos"] Michael (his name in translation from the Hebrew means "who is like unto God") -- a faithful servitor of God, wherein he hurled down from Heaven the arrogantly proud day-star Lucifer together with the other fallen spirits. And to the remaining Angelic powers he cried out: "Let us attend! Let us stand aright before our Creator and not ponder that which is displeasing unto God!" According to Church tradition, in the church service to the Archistrategos Michael concerning him, he participated in many other Old Testament events. During the time of the Exodus of the Israelites from Egypt he went before them in the form of a pillar of cloud by day and a pillar of fire by night. Through him the power of the Lord was made manifest, annihilating the Egyptians and Pharaoh who were in pursuit of the Israelites. The Archangel Michael defended Israel in all its misfortunes.
He appeared to Jesus Son of Navin (Joshua) and revealed the will of the Lord at the taking of Jericho (Nav / Josh 5:13-16). The power of the great Archistrategos of God was manifest in the annihilation of the 185 thousand soldiers of the Assyrian emperor Sennacherib (4  Kings 19:35); also in the smiting of the impious leader Antiochos Illiodoros; and in the protecting from fire of the Three Holy Youths -- Ananias, Azarias and Misail, thrown into the fiery furnace for their refusal to worship an idol (Dan 3:22-25).
Through the will of God, the Archistrategos Michael transported the Prophet Avvakum (Habbakuk) from Judea to Babylon, so as to give food to Daniel, locked up in a lions' den (Kondak of Akathist, 8).
The Archangel Michael prevented the devil from displaying the body of the holy Prophet Moses to the Jews for idolisation (Jude 1:9).
The holy Archangel Michael showed his power when he miraculously saved a lad, cast by robbers into the sea with a stone about his neck at the shores of Athos [Athos Paterikon].
From ancient times the Archangel Michael was famed by his miracles in Rus'. In the Volokolamsk Paterikon there is included a narrative of the Monk Paphnutii of Borovsk with an account of Tatar "baskaki" [tax-gatherers] concerning the miraculous saving of Novgorod the Great: "And wherefore Great Novgorod never was taken by the Hagarites ... when by the sufferance of God for our sins the godless Hagarite emperor Batu devoured and set aflame the Russian land and was come to the New City (i.e. Novgorod) and God and the MostHoly Mother of God shielded it with an appearance of Michael the Archistrategos, which did forbid him to enter into it. He [Batu] was come to the Lithuanian city and did come towards Kiev and did see the stone church over the doors of which the great Archangel Michael had written and spoken unto the prince his allotted fate: 'By this we have forbidden entry into Great Novgorod'."
To the Archistrategos Michael are dedicated many a monastery, cathedrals, court and merchant churches. In old Kiev at the time of the accepting of Christianity, there was erected a cathedral of the Archangel, and a monastery also was built in his name. Archangel cathedrals stand at Smolensk, Nizhni Novgorod, Staritsa, a monastery at Great Ustiug (beginning XIII Century), and a cathedral at Sviyazhsk. In Rus' there was not a city, wherein was not a church or chapel, dedicated to the Archangel Michael. One of the chief temples of the city of Moscow -- the burial church in the Kremlin -- is dedicated to him. Numerous and beautiful icons of the Chief-in-Rank of the Highest Powers are also in his Cathedral. One of these -- the Icon "Blest Soldiery" --written in the Uspenie [Dormition] Cathedral of the Moscow Kremlin, where the saintly soldiers -- Russian princes -- are depicted under the leadership of the Archistrategos Michael.
From Sacred Scripture and Sacred Tradition are likewise known the Archangels:
On icons the Archangels are depicted in accord with the trait of their service:
On this day in the year 351 A.D. the Great saints Marcianus and Marcurius were martyred. They were disciples of St. Paul the martyr, the Patriarch of the City of Constantinople.
When Emperor Constantius, son of Constantine the Great, adopted the belief of Arius, Abba Paul the Patriarch opposed him, so the Emperor exiled him to Armenia, where he was killed by strangulation.
These two saints cried over St. Paul on the day he was exiled and stated that the Emperor followed the belief of Arius who was excommunicated. A certain Arian man made an accusation against them to the Emperor. He had them brought to him and ordered them to be slain with the sword. They were killed and buried, and their bodies remained there until the time of St. John Chrysostom (Golden Mouth). When he heard their story, he had their bodies brought to the City of Constantinople. He built a church for them and transferred their bodies to it and celebrated a feast for them.