The Forty-five Martyrs of Nikopolis contested during the reign of Licinius, in the year 315. After many torments, they were burnt alive.

In 451, during the reign of the Sovereigns Marcian and Pulcheria, the Fourth Ecumenical Council was convoked in Chalcedon against Eutyches and those of like mind with him. After much debate, the Fathers who were the defenders of Orthodoxy, being 630 in number, agreed among themselves and with those who were of contrary mind, to write their respective definitions of faith in separate books, and to ask God to confirm the truth in this matter. When they had prepared these texts, they placed the two tomes in the case that held Saint Euphemia's relics, sealed it, and departed. After three days of night-long supplications, they opened the reliquary in the presence of the Emperor, and found the tome of the heretics under the feet of the Martyr, and that of the Orthodox in her right hand. (For her life, see Sept. 16.)

It is believed that the Synaxis of the Archangel Gabriel was transferred to this day from March 26 so that it could be celebrated more festively than in the period of the Great Fast; and, in fact, all the miracles of the Archangel are celebrated on this feast day, which has been listed here in the church books since the ninth century.

Grandson of Saint Olga, Saint Vladimir ascended the throne of Kiev in 980. Though a zealous idolater, he was illumined by the grace of God, accepted the Christian Faith, and completely changed his ways. He was baptized in Cherson in 988, receiving the name Basil; he came forth from the font not only healed of a blindness lately afflicting him, but also from being passionate and warlike, he became meek, peaceable, and exceedingly godly. Whereas his grandmother had refused marriage with the Emperor in Constantinople (see July 11), he married Anna, sister of the Emperors Basil and Constantine, and was accompanied home by priests from Constantinople. Diligently seeking to spread Christianity throughout his realm like a new Constantine, he destroyed the idols (having the chief diety Perun scourged and then cast into the Dnieper River), and summoned all his subjects to Holy Baptism. He reposed in peace in 1015.

On the Sunday that falls from the 13th to the 19th of the present month, we chant the Service to the 630 Holy and God-bearing Fathers who came together for the 4th Ecumenical Council who assembled in Chalcedon in 451, to condemn Eutyches, who taught that there was only one nature, the divine, in Christ after the Incarnation, and Dioscorus, Patriarch of Alexandria, who illegally received Eutyches back into communion and deposed Saint Flavian, Patriarch of Constantinople, who had excommunicated Eutyches.

In the Slavic tradition, on this Sunday, the Fathers of the first six Ecumenical Councils are all commemorated.

This Martyr lived during the reign of Claudius II (268-270). She was from Pisidia of Cilicia and was the only daughter of a certain priest of the idols. On being orphaned by her mother, she was handed over to a certain woman who instructed her in the Faith of Christ. When she was fifteen years old, she was apprehended by the ruler of Olmbrius, and when asked her name, homeland, and faith, she answered: "My name is Marina; I am the offspring of the Pisidia; I call upon the Name of my Lord Jesus Christ." Because of this she endured bonds, imprisonment, and many whippings, and was finally beheaded in the year 270. Saint Marina is especially invoked for deliverance from demonic possession.