At ille piissimus ut erat

Source: 
Roma, Biblioteca Vallicelliana, C.5
Folio: 
069v
Sequence: 
1
Feast: 
Mauri
Office/Mass: 
M
Genre: 
A
Position: 
1.4
Cantus ID: 
200392
Mode: 
6
Differentia: 
1
Differentia database: 
1--h-hg-f-gh-g-f--4 69i