works written by ethnic Persians in other languages, such as Greek and Arabic, to be included. At the same time, not all literature written in Persian is written by ethnic Persians or Iranians, as Turkic, Caucasian, and Indic poets and writers have also used the Persian language in the environment of Persianate cultures. Described as one of the great literatures of humanity, including Goethe's assessment of it as one of the four main bodies of world literature, Persian literature has its roots in surviving works of Middle Persian and Old Persian, the latter of which date back as far as 522 BCE, the date of the earliest surviving Achaemenid inscription, the Behistun Inscription. The bulk of surviving Persian literature, however, comes from the times following the Arab conquest of Persia c. 650 CE. After the Abbasids came to power (750 CE), the Iranians became the scribes and bureaucrats of the Arab empire and, increasingly, also its writers and poets. The New Persian language literature arose and flourished in Khorasan and Transoxiana because of political reasons, early Iranian dynasties such as the Tahirids and Samanids being based in Khorasan. Persian poets such as Ferdowsi, Sa'di, Hafiz, Attar, Nezami, Rumi and Omar Khayyam are also known in the West and have influenced the literature of many countries. Indic For a thousand years, since the invasion of India by the Ghaznavids, the Persian-Islamic culture of the eastern half of the Islamic world started to influence the Indian culture. Persian was the official language of most Indian empires such as the Ghaznavids, the Delhi Sultanate, the Bengal Sultanate, the Deccan Sultanates (such as the Qutb Shahi dynasty) and the Mughal Empire. Persian artistic forms in literature and poetry such as ghazals have come to significantly affect Urdu and other Indian literature. More Persian literature was produced in India than in the Iranian world. As late as the 20th century, Allama Iqbal chose Persian for some of his major poetic works. The first Persian language newspaper was also published in India, given that printing machines were first implemented in India. In Bengal, Muslim writers were exploring different themes through Islamic narratives and epics such as culture, cosmology, love and history. Starting from Shah Muhammad Saghir in the 14th century, Muslim writers began to enrich the Bengali language for over 600 years, often being actively supported and promoted by the rulers themselves. The early 20th century