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Gregory was also a remarkable hymnographer. The hymns ascribed to him include: The [[Troparion|theotokion]] "It is Truly Meet", a canon to the Most Holy Trinity which is read at Sunday Vigil, and a canon to the Holy Cross. In the book of canons of St. [[Cyril of White Lake ]] (from the year 1407) is found the "Canon of Supplication to the Lord Jesus Christ, a work also ascribed to Gregory the Sinaite."