treatise Hudud al-'Alam describes remaining royal buildings and Naw Bahara's decorations including painted image and wonderful works, probably secco or fresco murals and carvings on the temple's walls that survived into the author's time. Sanskrit, Greek, Latin and Chinese sources from the 2nd century BC to the 7th century AD, identify a people called "Tukharas", in the country later called Tukharistan. Badakhshan was earlier the seat of the Tukharas. There is no precise date for the Arab conquest of Badakhshan nor any record of how Islam was introduced there. Al-Tabari too mentions this region only once. In 736, Asad ibn Abdallah al-Qasri sent an expedition into Upper Tokharistan and Badakhshan against the rebel Al-Harith ibn Surayj who had occupied the fortress of Tabushkhan. Juday' b. 'Ali al-Kirmani, who was sent on the expedition against al-Harith, captured Tabushkhan. Juday also had its captive defenders killed while its women and children were enslaved and sold in Balkh despite being of Arab origin. al-Harith later allied with the Turgesh and continued his rebellion until being pardoned by Caliph Yazid b. Walid in 744. Taking advantage of the factional fighting among the Arabs, Transoxania started rebelling and Asad b. 'Abdallah in response attacked Khuttal in 737. Armed forces of Soghd, Chach and many Turks, led by the Turkish Khagan Sulu, arrived to assist them. Asad fled leaving behind the baggage of plunder from Khuttal. When he returned with the main body of his troops, the Turks retired to Tokharistan and he returned to Balkh. In December 737, the Turgesh attacked Khulm but were repelled by the Arabs. Bypassing Balkh, they captured Guzgan's capital and sent out raiding parties. Asad mounted a surprise attack on the Turks at Kharistan, who only had 4,000 troops. The Turgesh suffered a devastating defeat and lost almost whole of their army. Sulu and al-Harith fled to the territory of Tokharistan's Yabghu, with Sulu returning to his territory in winter of 737–738. The Zunbils The Zunbils in the pre-Saffarid period ruled in Zabulistan and Zamindawar, stretching between Ghazni and Bost, and had acted as a barrier against Muslim expansion for a long time. Zamindawar is known to have a shrine dedicated to the god Zun. It has been linked with the Hindu god Aditya at Multan, pre-Buddhist religious and kingship practices of Tibet, as well as Shaivism. The followers of the Zunbils were called Turks by the Arabic sources, however