Activity hipo posted an update 9 years, 6 months ago Ἅγιος ὁ Θεός – O Trisagios Ymnos – The Thrice Holy Hymn – 1st Tone hipo replied 9 years, 6 months ago https://en.wikipedia.org/wiki/Trisagion
https://en.wikipedia.org/wiki/Trisagion