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In page Xiao Noujin:

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Xiao Noujin disrupted Xiao Yanyan and her late husband's reforms and caused turmoil in Liao politics. She was very ambitious and didn't want her power at court to be diminished. She had plans for her younger son Yelü Zhongyuan to replace Yelü Zongzhen on the throne. Yelu Zhongyuan secretly told his brother, and Emperor Xingzong was angered. All of her allies and conspirators were executed, including her attendants and most of her relatives. In 1034, he demoted his mother to commoner status and sent her away from the palace.[citation needed]