losing their control over Iranians. The governors of Khurasan, the Tahirids, though appointed by the caliph, were effectively independent. When the Persian Saffarids from Sistan freed the eastern lands, the Buyyids, the Ziyarids and the Samanids in Western Iran, Mazandaran and the north-east respectively, declared their independence. The separation of the eastern territories from Baghdad was expressed in a distinctive Persianate culture that became dominant in west, central, and south Asia, and was the source of innovations elsewhere in the Islamic world. The Persianate culture was marked by the use of the New Persian language as a medium of administration and intellectual discourse, by the rise of Persianised-Turks to military control, by the new political importance of non-Arab ulama and by the development of an ethnically composite Islamic society. Pahlavi was the lingua franca of the Sassanian Empire before the Arab invasion, but towards the end of the 7th and the beginning of the 8th century Arabic became a medium of literary expression. In the 9th century, a New Persian language emerged as the idiom of administration and literature. The Tahirid and Saffarid dynasties continued using Persian as an informal language, although for them Arabic was the "language for recording anything worthwhile, from poetry to science", but the Samanids made Persian a language of learning and formal discourse. The language that appeared in the 9th and 10th centuries was a new form of Persian, derivative of the Middle-Persian of pre-Islamic times, but enriched amply by Arabic vocabulary and written in the Arabic script. The Persian language, according to Marshall Hodgson in his The Venture of Islam, was to form the chief model for the rise of still other languages to the literary level. Like Turkish, most of the more local languages of high culture that later emerged among Muslims were heavily influenced by Persian (Urdu being a prime example). One may call these traditions, carried in Persian or reflecting Persian inspiration, ‘Persianate’ by extension. This seems to be the origin of the term Persianate. Spread The Iranian dynasty of the Samanids began recording its court affairs in Persian as well as Arabic, and the earliest great poetry in New Persian was written for the Samanid court. The Samanids encouraged translation of religious works from Arabic into Persian. In addition, the learned authorities of Islam, the ulama, began using the Persian lingua franca in public. The crowning literary achievement in the