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Agios O Theos
http://www.newadvent.org/cathen/01211b.htmThe opening words in Greek of an invocation, or doxology, or hymn for it may properly receive any of these titles which in the Roman Liturgy is sung during the Improperia, or "Reproaches" at the ceremony of the Adoration of the Cross, on Good Friday.
Submitted in section: Religion & Spirituality: Christianity: Denominations: Catholicism: Reference: Catholic Encyclopedia: A: Agios O Theos