Iste est qui ante*

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Marginalia: 
A
Folio: 
227v
Sequence: 
16
Feast: 
Leonis
Office/Mass: 
V
Genre: 
A
Position: 
R
Cantus ID: 
003426
Mode: 
*
Addendum: 
P: 325