Haec est vera fraternitas

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
276r
Sequence: 
1
Feast: 
Comm. plurimorum Martyrum
Office/Mass: 
M
Genre: 
R
Position: 
2.2
Cantus ID: 
006804
Mode: 
1
Addendum: 
P: 422