What type of details about wang zhengjun can be gathered from the following bio? Bio: wang zhengjun -lrb- ; 71 bc -- 13 ad -rrb- , officially empress xiaoyuan -lrb- -rrb- , later and more commonly known as grand empress dowager wang , born in yuancheng -lrb- modern handan , hebei -rrb- , was an empress during the western han dynasty of china , who played important roles during the reigns of five successive han emperors -- her husband , her son , her two stepgrandsons , and her stepgreat-grandnephew -- and later -lrb- according to traditional historians , unwittingly -rrb- led to the usurpation of the throne by her nephew wang mang . she is largely viewed sympathetically by historians as an unassuming and benevolent if overly doting woman who suffered much in her long life , who tried to influence the empire as well as she could , and who was not a party to her nephew 's machinations , but whose failure , leading to the downfall of the western han dynasty , was her overdependence on her clan -lrb- the wangs -rrb- .
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