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Nicholas III (flourished 11th century) was an Eastern Orthodox patriarch of Constantinople (1084–1111), theologian and liturgical scholar noted for combatting doctrinal heresy and composing sacramental prayer texts for the Byzantine liturgy. Among Nicholas’ liturgical compositions are prayers and responses in the service rituals for baptism, marriage, confession, fasting, and communion. As emperor Alexis I Comnenus was negotiating with Pope Urban II the possibility of Western help against the Turks, Nicholas was consulted about the state...