Sequence for the Octave of the Epiphany: Iste dies celebris
Codex Sangallensis, Stiftsbibliothek Sankt Gallen, (St. Gallen, Switzerland), Cod. 381, pages 370-371
Image used by permission of Amadeus Verlag (Winterthur, Switzerland) and the Musikwissenschaftlisches Institut der Universität Basel (Switzerland).

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