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This paper discusses hitherto unidentified loose folios of a parchment liturgical and musical book held in the Archdiocesan Archive of Gniezno (Poland), containing the offertory and communion antiphons for the feasts De Trinitate and Corpus Christi. The author provides the codicological description of the leaves (analyzing Latin script, musical notation, ornamentation); identifies the time of their creation (15th century); indicates the type of the liturgical book to which they belong (graduale); seeks a melodic model for them and puts forward provenance hypotheses. He states that the melodics of the antiphons, although closest to the Cistercian tradition, are nevertheless variantly different from the melodic line preserved in foreign and Polish codices. It is possible to narrow down the dating of the leaves thanks to the type of Latin script, the calligraphic ornamentation of the initials and the spelling of certain letters.
Piotr Wiśniewski (Mon,) studied this question.