Trisagion

• abstract: The Trisagion (Greek: Τρισάγιον "Thrice Holy"), sometimes called by its opening line Agios O Theos or by the Latin Tersanctus, is a standard hymn of the Divine Liturgy in most of the Eastern Orthodox Churches, Oriental Orthodox Churches and Eastern Catholic Churches. In Western Christianity the Sanctus (a different formula) is used in the Mass.

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