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.
Timurid Empire
During the Timurid era, Central Asian society was bifurcated, with the responsibilities of government and rule divided into military and civilian spheres along ethnic lines. At least in the early stages, the military was almost exclusively Turko-Mongolian, while the civilian and administrative element was almost exclusively Persian. The spoken language shared by all the Turko-Mongolians throughout the area was Chaghatay. The political organization hearkened back to the steppe-nomadic system of patronage introduced by Genghis Khan. The major language of the period, however, was Persian, the native language of the Tājīk (Persian) component of society and the language of learning acquired by all literate and/or urban people. Timur was already steeped in Persian culture and in most of the territories he incorporated, Persian was the primary language of administration and literary culture. Thus the language of the settled "diwan" was Persian, and its scribes had to be thoroughly adept in Persian culture, whatever their ethnic origin. Persian became the official state language of the Timurid Empire and served as the language of administration, history, belles lettres, and poetry. The Chaghatay language was the native and "home language" of the Timurid family, while Arabic served as the language "par excellence" of science, philosophy, theology and the religious sciences.