Kuiju was a 13th century Mongol bandit. Tegana hired him to steal the First Doctor's TARDIS for Noghai in 1289.
Kuiju stole Ping-Cho's money and was later confronted by Ian Chesterton and Ping-Cho on the Karakorum road. When Tegana arrived, Ian threatened to kill Kuiju, but Tegana didn't care if Kuiju was killed. Kuiju tried to run off but, according to one account, he was caught and accidentally killed by one of Ling-Tau's men. (TV: Marco Polo)
According to another account, Kuiju was not killed. (PROSE: Marco Polo)