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Conquests in India and Central Asia

Kanishka's empire was certainly vast. It extended from southern Uzbekistan and Tajikistan, north of the Amu Darya (Oxus) in the north west to Northern India, as far as Mathura in the south east (the Rabatak inscription even claims he held Pataliputra and Sri Champa), and his territory also included Kashmir, where there was a town Kanishkapur (modern day Kanispora), named after him not far from the Baramulla Pass and which still contains the base of a large stupa. The Buddhist text Śrīdharmapiṭakanidānasūtra —known via a Chinese translation made in AD 472—refers to the conquest of Pataliputra by Kanishka.

Knowledge of his hold over Central Asia is less well established. The Hou Hanshu, states that general Ban Chao fought battles near Khotan with a Kushan army of 70,000 men led by an otherwise unknown Kushan viceroy named Xie (Chinese: 謝) in 90 AD. Ban Chao claimed to be victorious, forcing the Kushans to retreat by use of a scorched-earth policy. The territories of Kashgar, Khotan and Yarkand were Chinese dependencies in the Tarim Basin, modern Xinjiang. Several coins of Kanishka have been found in the Tarim Basin.

Kanishka have fought off an invasion by the Parthian Empire late in his reign. This war is attested in a single source, a Chinese translation of a lost Sanskrit original, A History of the Buddha's Successors.