Saint Catherine, who was from Alexandria, was the daughter of Constas (or Cestus). She was an exceedingly beautiful maiden, most chaste, and illustrious in wealth, lineage, and learning. By her steadfast understanding, she utterly vanquished the passionate and unbridled soul of Maximinus, the tyrant of Alexandria; and by her eloquence, she stopped the mouths of the so-called philosophers who had been gathered to dispute with her. She was crowned with the crown of martyrdom in the year 305. Her holy relics were taken by Angels to the holy mountain of Sinai, where they were discovered many years later; the famous monastery of Saint Catherine was originally dedicated to the Holy Transfiguration of the Lord and the Burning Bush, but later was dedicated to Saint Catherine. According to the ancient usage, Saints Catherine and Mercurius were celebrated on the 24th of this month, whereas the holy Hieromartyrs Clement of Rome and Peter of Alexandria were celebrated on the 25th. The dates of the feasts of these Saints were interchanged at the request of the Church and Monastery of Mount Sinai, so that the festival of Saint Catherine, their patron, might be celebrated more festively together with the Apodosis of the Feast of the Entry of the Theotokos.

This Saint was from Bethsaida of Galilee; he was the son of Jonas and the brother of Peter, the chief of the Apostles. He had first been a disciple of John the Baptist; afterwards, on hearing the Baptist's witness concerning Jesus, when he pointed Him out with his finger and said, "Behold the Lamb of God, Which taketh away the sin of the world" (John 1.29,36), he straightway followed Christ, and became His first disciple; wherefore he is called the First-called of the Apostles. After the Ascension of the Saviour, he preached in various lands; and having suffered many things for His Name's sake, he died in Patras of Achaia, where he was crucified on a cross in the shape of an "X," the first letter of "Christ" in Greek; this cross is also the symbol of Saint Andrew.