O vera summa sempiterna

Source: 
Vercelli, Biblioteca Capitolare, CLXX
Folio: 
200r
Sequence: 
14
Feast: 
De Trinitate
Office/Mass: 
L
Genre: 
A
Position: 
4
Cantus ID: 
004087
Mode: 
*
Differentia: 
*
Manuscript Reading Full Text (standardized spelling): 
O vera summa sempiterna unitas pater filius spiritus sanctus