The Sasanian Empire was the last kingdom of the Persian Empire before the rise of Islam and included parts of Turkmenistan, Uzbekistan, Tajikistan and Transoxiana. The Sasanian Empire during Late Antiquity is considered to have been one of Iran's most important and influential historical period
The Protectorate General to Pacify the West, or Anxi Protectorate (640 CE–790 CE) was a protectorate established by the Tang Dynasty in 640 to control the Tarim Basin. The head office was first established at the prefecture of Xi, now known as Turpan, but was later shifted to Qiuci (Kucha) The Four Garrisons of Anxi in Kucha, Khotan, Kashgar, and Karashahr were installed between 648 and 658 as garrisons under the western protectorate. In 659 Sogh (Chuy Region), Ferghana, Tashkent, Bukhara, Samarkand, Balkh, Herat, Kashmir, the Pamirs, Tokharistan, and Kabul all submitted to the protectorate under Emperor Gaozong of Tang.