[quote="nagyszakall, post:10, topic:326115"]
Remember, Latin, too, was a vernacular once and there was never a time in the history of the Catholic Church in which Latin remained globally the exclusive language of liturgy.
[quote="JMJ_coder, post:11, topic:326115"]
Remember that Latin was once the vernacular in the West. The Vulgate gets its name because it was translated into the vulgar (a.k.a vernacular) tongue.
I don't think so. Vetus Latina, which preceded the Latin Vulgate, would have probably been closer to the vernacular. It was called the Vulgate (there was a Greek Vulgate as well), because it was the most commonly used translation.
Vulgar Latin was the street language of the Romans. From Vulgar Latin descended the modern Romance languages. Church Latin was the Christianized adaptation of the vocabulary and grammar codified by Cicero and other Classicists. This would not have been the vernacular of the period. Proof that there are differences is shown in the Appendix Probi.
FWIW, Ecclesiastical Latin wasn't the only non-vulgar/non-vernacular of the Church. Old Church Slavonic was another such Church language.