Zhang Changzong (張昌宗) (died February 20, 705), formally the Duke of Ye (鄴公), nickname Liulang (六郎), was an official of Wu Zetian's Zhou Dynasty who, along with his brother Zhang Yizhi, became a lover of Wu Zetian and became very powerful late in her reign. Both he and his brother were killed in a coup that overthrew Wu Zetian in 705.
Read more about Zhang Changzong: Background, As Wu Zetian's Lover, Death