Trisagion
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The Trisagion, sometimes called by its incipit Agios O Theos is a standard hymn of ancient origin of the Divine Liturgy in most of the Eastern Orthodox, Western Orthodox, Oriental Orthodox, and Easter
Old Testament Trinity, an icon by Andrei Rublev, c. 1400 (Tretyakov Gallery, Moscow)
A fresco icon of Christ the Ancient of Days, Ubisi, Georgia
Sanctus
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The Sanctus is a hymn in Christian liturgy. It may also be called the epinikios hymnos when referring to the Greek rendition and parts of it are sometimes called "Benedictus". Tersanctus is another, r
Trisagion
…The full version normally looks like this: While it is possible that the Trisagion has origins in the biblical 'thrice holy' of Isaiah 6:3 (the Sanctus: Holy, holy, holy, Lord of Sabaoth. Heaven and earth are full of your glory', etc.), they are today separate prayers. The latter is used at a different…
Text of the Sanctus in an 11th-century manuscript
The word "Sanctus" as decoration in the St Giles' Church at Cheadle in Staffordshire, England
The towers of the Sagrada Família church in Barcelona, Spain are decorated with the words "Sanctus", "Hosanna" and "Excelsis".