Source: PL-Wn 12722 V Graduał opata tynieckiego MścisławaFolio: 261vSequence: 1Office: MASSGenre: AllCantus ID: g02805Mode: 8Full text: Alleluia Haec est vera fraternitas quae numquam potuit violari certamine qui effuso sanguine secuti sunt dominumNotes: palimpsestExternal image link: Image link