Khun Sa, aka Chang Chi-fu (pinyin: Zhang Qifu; Thai: Chan Jangtrakul (17 February 1934 26 October 2007) was a Burmese warlord. He was dubbed the 'Opium King' due to his opium trading in the Golden Triangle region. He was also the leader of the Shan United Army and the Mong Tai Army. Khun Sa was born to a Chinese father and a Shan mother. He adopted the pseudonym Khun Sa, meaning 'Prince Prosperous'. In his youth he trained with the Kuomintang, which had fled into the border regions of Burma from Yunnan upon its defeat in the Chinese Civil War, and eventually went on to form his own army of a few hundred men.