Piece ID is

PAssemezo eiusdem toni à I. B. Besardo.

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

GB-Lbl K.4.h.1

Start: Folio: 85rSystem: 1 View Image
Continuation: Folio: 85v View Image
Finish: Folio: 86r View Image

People associated with source:

Jean-Baptiste BesardComposer(Probable)