Piece ID is

GAlliaIda Diomedis. [sic]

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

GB-Lbl K.4.h.1

Start: Folio: 122vSystem: 8 View Image
Finish: Folio: 123r View Image

People associated with source:

Diomedes CatoComposer(Probable)