Piece ID is

GAlliarda Victoris de Montbuisson.

in THESAURUS HARMONICUS DIVINI LAURENCINI ROMANI, NEC NON [...] Ad decennium.

GB-Lbl K.4.h.1

Start: Folio: 114rSystem: 7 View Image

People associated with source:

Victor de MontbuissonComposer(Probable)