From the Liturgy of St. Basil to the Liturgy of St. John Chrysostom – When and Why: A Preliminary Report

Sometime between the 10^th and the 11^th centuries the Divine Liturgy of St. John Chrysostom, for some unknown reason, became the principal Eucharistic Liturgy of Constantinople replacing the formulary of St. Basil the Great, which until that time was listed first in the extant manuscripts of the Greek Euchologia. This change represents a dramatic shift in the liturgical practice of the Orthodox Church. The paper will present a possible timeline for the shift and rationales for it.