张易之
Zhang Yizhi (張易之; died February 20, 705), formally the Duke of Heng (恆公), nickname Wulang (五郎) and Zhang Changzong (張昌宗; died February 20, 705), formally the Duke of Ye (鄴公), nickname Liulang (六郎), were two brothers who served as officials of Wu Zetian's Zhou Dynasty and became very powerful late in her reign. Both brothers were killed in a coup that overthrew Wu Zetian in 705.