O beate Petre*

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
093r
Sequence: 
2
Feast: 
Cathedra Petri
Office/Mass: 
M
Genre: 
A
Position: 
3.
Cantus ID: 
203383
Mode: 
1
Differentia: 
*