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.
World language
Historical languages which had international significance as the "lingua franca" of a historical empire include Egyptian in Ancient Egypt; Sumerian, Akkadian and Aramaic in the various Mesopotamian civilizations and empires in the Ancient Near East; Ancient Greek in the Greek colonies in the form of various dialects, evolving to Koine Greek in the Hellenistic world, after the conquests of Alexander the Great and the Macedonian Empire, and subsequently in the eastern part of the Roman Empire and the territories of the Byzantine Empire; Latin in the Roman Empire and presently as the standard liturgical language for the Catholic faithful worldwide; Classical Chinese in East Asia during the Imperial era of Chinese history; Persian during the various succeeding Persian Empires, and once served as the second lingua franca of the Islamic World after Arabic; Sanskrit during the ancient and medieval historical periods of various states in South Asia, Southeast Asia, and Central Asia, and like Latin an important liturgical language of the Vedic religions.