Yang Zaisi
Yang Zaisi ( 楊再思 ) ( died 709 ) , formally Duke Gong of Zheng ( 鄭恭公 ) , was an official of the Chinese dynasty Tang Dynasty and Wu Zetian's Zhou Dynasty , serving several times as chancellor during the reigns of Wu Zetian and her son Emperor Zhongzong . 
<triplet> Yang Zaisi <subj> chancellor <obj> position held <triplet> Wu Zetian <subj> Tang Dynasty <obj> family <subj> Emperor Zhongzong <obj> child <triplet> Emperor Zhongzong <subj> Tang Dynasty <obj> time period