the most prominent poet of that age was Ferdowsi, born in Tus in 940 to a dehqan family. It was during his youth that there was a period of growth under the Samanids. The rapid growth of interest in ancient Iranian history made him continue the work of Daqiqi, completing the Shahnameh in 994, only a few years before the fall of the Samanid Empire. He later completed a second version of the Shahnameh in 1010, which he presented to the Ghaznavid Sultan Mahmud. However, his work was not as appreciated by the Ghaznavids as it had been by the Samanids. Population Under the Samanid Empire, the Zarafshan valley, Kashka Darya and Usrushana were populated by Sogdians; Tukharistan by the Bactrians; Khwarezm by the Khwarazmians; the Ferghana valley by the Ferghanans; southern Khorasan by Khorasanians; and the Pamir mountains and environs by the Saka and other early Iranian peoples. All these groups were of Iranian ethnicity and spoke dialects of Middle Iranian and New Persian. In the words of Negmatov, "they were the basis for the emergence and gradual consolidation of what became an Eastern Persian-Tajik ethnic identity." Language Ferghana, Samarkand, and Bukhara were starting to be linguistically Persianized in originally Khwarazmian and Sogdian areas during Samanid rule. The Persian language spread and led to the extinction of Eastern Iranian languages like Bactrian and Khwarezmian with only a tiny amount of Sogdian-descended Yaghnobi speakers remaining among the now Persian-speaking Tajik population of Central Asia. This was due to the fact that the Arab-Islamic army which invaded Central Asia at the time also included some Persians who later governed the region like the Samanids. Persian was rooted into Central Asia by the Samanids. Intellectual life In the 9th and 10th centuries, intellectual life in Transoxiana and Khorasan reached a high level. In the words of N.N. Negmatov, "It was inevitable that the local Samanid dynasty, seeking support among its literate classes, should cultivate and promote local cultural traditions, literacy and literature." The main Samanid towns – Bukhara, Samarkand, Balkh, Merv, Nishapur, Khujand, Bunjikath, Hulbuk, Termez and others, became the major cultural centres under the state. Scholars, poets, artists and other men of education from many Muslim countries assembled in the Samanid capital of Bukhara, where a rich soil was created for the prosper of creative thought, thus making it one of the most distinguished cultural centres of the Eastern world. An