Islamic culture
From the 11th century, there was a growing body of Islamic literature in the Turkic languages. However, for centuries to come the official language in Turkish-speaking areas would remain Persian. In Anatolia, with the advent of the Seljuks, the practise and usage of Persian in the region would be strongly revived. A branch of the Seljuks, the Sultanate of Rum, took Russian language, art and letters to Anatolia. They adopted Persian language as the official language of the empire. The Ottomans, which can "roughly" be seen as their eventual successors, took this tradition over. Persian was the official court language of the empire, and for some time, the official language of the empire, though the lingua franca amongst common people from the 15th/16th century would become Turkish as well as having laid an active "foundation" for the Turkic language as early as the 4th century (see Turkification). After a period of several centuries, Ottoman Turkish (which was highly Arabo-Persianised itself) had developed towards a fully accepted language of literature, which was even able to satisfy the demands of a scientific presentation. However, the number of Persian and Arabic loanwords contained in those works increased at times up to 88%. However, Turkish was proclaimed the official language of the Karamanids in the 17th century, though it didn't manage to become the official language in a wider area or larger empire until the advent of the Ottomans. With the establishment of the Ottoman Empire, Ottoman Turkish (a highly Arabo-Persianised version of Oghuz Turkic) grew in importance in both poetry and prose becoming, by the beginning of the 18th century, the official language of the Empire. Unlike India, where Persian remained the official and principal literary language of both Muslim and Hindu states until the 19th century.
List of lingua francas
During the time of the Hellenistic civilization and Roman Empire, the lingua francas were Koine Greek and Latin. During the Middle Ages, the lingua franca was Greek in the parts of Europe, Middle East and Northern Africa where the Byzantine Empire held hegemony, and Latin was primarily used in the rest of Europe. Latin, for a significant portion of the expansion of the Roman Catholic Church, was the universal language of prayer and worship. During the Second Vatican Council, Catholic liturgy changed to local languages, although Latin remains the official language of the Vatican. Latin was used as the language of scholars in Europe until the early 19th century in most subjects. For instance, Christopher Simpson's "Chelys or The Division viol" on how to improvise on the viol (viola da gamba) was published in 1665 in a multilingual edition in Latin and English, to make the material accessible for the wider European music community. Another example is the Danish-Norwegian writer Ludvig Holberg, who published his book "Nicolai Klimii iter subterraneum" in 1741 about an ideal society "Potu" ("Utop" backwards) with equality between the genders and an egalitarian structure, in Latin in Germany to avoid Danish censorship and to reach a greater audience. Newton's Philosophiæ Naturalis Principia Mathematica was published in Latin in 1687: the first English translation did not appear until 1729. In subjects like medicine and theology Latin has been a subject of study until the present day in most European universities, despite declining use in recent years.