Italian was adopted by the state after the Unification of Italy, having previously been a literary language based on Tuscan as spoken mostly by the upper class of Florentine society. Its development was also influenced by other Italian languages and, to some minor extent, by the Germanic languages of the post-Roman invaders. The incorporation into Italian of learned words from its own ancestor language, Latin, is another form of lexical borrowing through the influence of written language, scientific terminology and the liturgical language of the Church. Throughout the Middle Ages and into the early modern period, most literate Italians were also literate in Latin and thus they easily adopted Latin words into their writing—and eventually speech—in Italian. Unlike most other Romance languages, Italian retains Latin's contrast between short and long consonants. Almost all native Italian words end with vowels, a factor that makes Italian words extremely easy to use in rhyming. Italian has a 7 vowel sound system ('e' and 'o' have mid-low and mid-high sounds); Classical Latin had 10, 5 with short and 5 with long sounds.