Greek Symbol of Faith (Credo) in the 950 Sacramentary of Mainz

 In the 10th Century Sacramentary of Mainz, probably belong to Abbey of St. Alban, we find the Ordinary of the Mass (i.e., Gloria, Credo, Sanctus, etc) written in Greek transliterated in Latin letters. 

For the Symbol of Faith, or Credo, on page 10 we read the following:

"Ke is to Pneumato Agion to Kirion ke Zoopion to ek tu Patros ekporeugemnon to sin Patri ke Io sin proskynumenos ke sin doxa." 

That is:

"And in the Holy Ghost, the Lord and Life-Giver, from the Father Proceeding, with the Father and the Son together worshipped and glorified." 

Singing the Ordinary of the Mass in the Greek language was not entirely unknown in the Latin West at the time.