The writing later changed from what was initially either a right-to-left or a boustrophedon During the late republic and into the first years of the empire, a new Classical Latin arose, a conscious creation of the orators, poets, historians and other literate men, who wrote the great works of classical literature, which were taught in grammar and rhetoric schools.Today's instructional grammars trace their roots to such schools, which served as a sort of informal language academy dedicated to maintaining and perpetuating educated speech.Despite dialectal variation, which is found in any widespread language, the languages of Spain, France, Portugal, and Italy retained a remarkable unity in phonological forms and developments, bolstered by the stabilising influence of their common Christian (Roman Catholic) culture.
If it was not preferred in Classical Latin, then it most likely came from the undocumented contemporaneous Vulgar Latin.
For example, the Romance for "horse" (Italian cavallo, French cheval, Spanish caballo, Portuguese cavalo and Romanian cal) came from Latin caballus. Therefore caballus was most likely the spoken form.
Latin was used as the language of international communication, scholarship, and science until well into the 18th century, when it began to be supplanted by vernaculars.
Ecclesiastical Latin remains the official language of the Holy See and the Roman Rite of the Catholic Church.
The Vulgar Latin dialect that would later become Romanian diverged somewhat more from the other varieties, as it was largely cut off from the unifying influences in the western part of the Empire.