 Karasahr was besieged in 644 by Guo . Tang forces defeated the kingdom , captured the king , and a pro @-@ Tang member of the royal family was enthroned as ruler . The new king was deposed by the Western Turks soon afterwards , and the Western Turks regained suzerainty over Karasahr . Suvarnadeva died between 646 and 648 , and his brother Haripushpa ( Chinese : <unk> ) inherited the throne as Kucha 's king . Although Haripushpa sent two tribute embassies to the Tang court , Tang Taizong had already decided to punish Kucha 's pro @-@ Turk stance by launching an expedition against the kingdom . 
