It reflects the work of the Cappadocian Fathers to both combat heresy and define Trinitarian theology for the Christian Church. This liturgy was probably used originally by the School of Antioch (John having been a deacon and priest in Antioch) and, therefore, most likely developed from West Syriac liturgical rites. In Constantinople, it was refined and beautified under John's guidance as Archbishop (398–404). As a divine liturgy of the Church of Holy Wisdom, Hagia Sophia, it became over time the usual divine liturgy in the churches within the Byzantine Empire. Just two divine liturgies (aside from the presanctified), those of Saints John and Basil the Great, became the norm in the Byzantine Church by the end of the reign of Justinian I. After the Quinisext Council and the liturgical reforms of Patriarch Theodore Balsamon, the Byzantine Rite became the only rite in the Eastern Orthodox Church, remaining so until the 19th and 20th Century re-introduction by certain jurisdictions of Western Rites. (Source: en.wikipedia.org)