Zhang Xueliang or Chang Hsüeh-liang (1901 - 2001), occasionally called Peter Hsueh Liang Chang and nicknamed the "Young Marshal", was the effective ruler of Manchuria and much of northern China after the assassination of his father, Zhang Zuolin, by the Japanese on 4 June 1928. As an instigator of the Xi'an Incident, he spent over fifty years under house arrest and is regarded by the People's Republic of China as a patriotic hero.