The Nativity Fast is one of four main fast periods throughout the ecclesiastical year. Beginning on November 15 and concluding on December 24, the Nativity Fast gives individuals the opportunity to prepare for the Feast of the Nativity of Our Lord and Savior in the Flesh on December 25. By abstaining from certain food and drink, particularly from meat, fish, dairy products, olive oil, and wine, as well as focusing more deeply on prayer and almsgiving, we can find that the primary aim of fasting is to make us conscious of our dependence upon God.

This Apostle, who was also called Levi, was the son of Alphaeus and had Galilee as his homeland. A publican before being called by Christ, he became one of the Twelve Apostles, and an Evangelist. While still in Palestine, he wrote his Gospel first in Hebrew, being also the first of all to write the Gospel. When he is depicted in icons, there is portrayed next to him the likeness of a man, one of the symbolic living creatures mentioned by Ezekiel (1.10), which, as Saint Irenaeus writes, is a symbol of our Saviour's Incarnation.

Saint Gregory was born in Neocaesarea of Pontus to parents who were not Christians. He studied in Athens, in Alexandria, in Beirut, and finally for five years in Caesarea of Palestine under Origen, by whom he was also instructed in the Faith of Christ. Then, in the year 240, he became bishop of his own city, wherein he found only seventeen Christians. By the time the Saint reposed about the year 265, there were only seventeen unbelievers left there. Virtually the whole duration of his episcopacy was a time of continual, marvellous wonders worked by him. Because of this, he received the surname "Wonderworker"; even the enemies of the truth called him a second Moses (see Saint Basil the Great's On the Holy Spirit, ch. 29).

Saint Romanus, who was from Antioch, lived during the reign of Maximian. He presented himself before Asclepiades the Eparch, and rebuked him, saying, "The idols are not gods; even a little child could tell you that." Then the Saint asked that a child be brought in from the market, that he might be the judge of the matter at hand. Therefore, when the child was asked, "Which God must we worship?" he replied, "Christ." The child was beaten mercilessly and beheaded at the command of the tyrant. As for Saint Romanus, his tongue was cut out, and then he was cast into prison, where he was strangled in the year 305.

The Divine Scriptures do not tell us with any certainty when the Prophet Obadiah lived nor what was his homeland. Thus, some say that he is that Obadiah who was Ahab's steward, who, because of Jezebel's wrath, hid one hundred prophets in a cave and fed them with bread and water (III Kings 18:4), and that he later became a disciple of Elias the Prophet about 903 B.C. But others surmise from the words of the same prophetical book that he is somewhat later than Joel (celebrated on Oct. 19). He is also called Obdiu, or Abdiu, or Obadiah; his name means "servant of God." His book of prophecy, which consists of only one chapter, is ranked fourth among the minor Prophets.

Saint Gregory who was from Irenopolis of the Decapolis of Asia Minor, was the son of Sergius and Mary. He became a monk as a young man, and after struggling for many years in virtue and prayer under obedience to a wise spiritual father, he was informed by revelation that it was the will of God for him to live, like the Patriarch Abraham, with no certain dwelling, moving from place to place. His journeyings took him to Ephesus, Constantinople, Corinth, Rome, Sicily, Thessalonica, and again to Constantinople, where, after many labours in defence of Orthodoxy against Iconoclasm, he reposed in peace in the first half of the ninth century. He had two disciples, one of whom was Saint Joseph the Hymnographer (see Apr. 3), who wrote the Menaion service for Saint Gregory, his father in Christ.

According to the tradition of the Church, the Theotokos was brought to the Temple at three years of age, where she was consecrated to God and spent her days until she was fourteen or fifteen years old; and then, as a mature maiden, by the common counsel of the priests (since her parents had reposed some three years before), she was betrothed to Joseph.