O vera summa sempiterna

Source: 
Vercelli, Biblioteca Capitolare, CLXX
Folio: 
200v
Sequence: 
12
Feast: 
De Trinitate
Office/Mass: 
T
Genre: 
A
Cantus ID: 
004086
Mode: 
*
Differentia: 
*
Manuscript Reading Full Text (standardized spelling): 
O vera summa sempiterna trinitas pater et filius et spiritus sanctus