On September 14, 407, Saint John Chrysostom, Patriarch of Constantinople, died. The liturgy of Saint John is practiced by all Orthodox Christians. An excerpt from the article:
"The fame of the holy preacher grew, and in the year 397 with the death of Archbishop Nectarius of Constantinople, successor to Saint Gregory the Theologian, Saint John Chrysostom was summoned from Antioch, and elected to the See of Constantinople. At the capital, the holy archpastor was not able to preach as often as he had at Antioch. Many matters awaited the saint’s attention, and he began with the most important -- the spiritual perfection of the priesthood. He himself was the best example of this. The financial means apportioned for the archbishop were channeled by the saint into the upkeep of several hospices for the sick and two hostels for pilgrims. He fasted strictly and ate very little food, and usually refused invitations to dine because of his delicate stomach.
The saint’s zeal in spreading the Christian Faith extended not only to the inhabitants of Constantinople, but also to Thrace to include Slavs and Goths, and to Asia Minor and the Pontine region. He established a bishop for the Bosphorus Church in the Crimea. Saint John sent off zealous missionaries to Phoenicia, to Persia, and to the Scythians, to convert pagans to Christ. He also wrote letters to Syria to bring back the Marcionites into the Church, and he accomplished this. Preserving the unity of the Church, the saint would not permit a powerful Gothic military commander, who wanted the emperor to reward his bravery in battle, to open an Arian church at Constantinople. The saint exerted much effort in enhancing the splendor of the church services: he compiled a Liturgy, he introduced antiphonal singing for the all-night Vigil, and he wrote several prayers for the rite of anointing the sick with oil."