Istorum est*

Source: 
Valenciennes, Bibliothèque municipale, 114
Folio: 
131r
Sequence: 
7
Feast: 
Cyrici
Office/Mass: 
M
Genre: 
A
Position: 
2.4
Cantus ID: 
003451
Mode: 
8
Differentia: 
1
Differentia database: 
1--k-k-j-k-h-g--4 118a