Please answer the following question: What key details about shangguan yi can be extracted from the following bio? Bio: shangguan yi -lrb- ; 608 -- 4 january 665 -rrb- , courtesy name youshao -lrb- -rrb- , formally duke of chu -lrb- -rrb- , was an official of the chinese dynasty tang dynasty , serving as chancellor during the reign of emperor gaozong . in 664 , with emperor gaozong displeased with his wife empress wu -lrb- later known as wu zetian -rrb- for her controlling behavior , shangguan proposed that empress wu be deposed , a proposal that emperor gaozong was initially receptive to but disavowed once empress wu discovered it . empress wu then had shangguan accused of plotting treason with emperor gaozong 's oldest son , the former crown prince li zhong -lrb- who had been displaced by empress wu 's son li hong -rrb- , and shangguan was executed . his granddaughter shangguan wan ' er later served as a key secretary to empress wu and a concubine to her son emperor zhongzong .
Answer:
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