武威市
However, Juqu Mujian also carried on an affair with his brother's wife, Lady Li, and Lady Li and Juqu Mujian's sisters carried out a plot to poison Princess Tuoba. Emperor Taiwu, hearing that his sister had been poisoned, sent a number of doctors to the Northern Liang capital Guzang (姑臧, in modern Wuwei, Gansu), and they were able to save her. Emperor Taiwu demanded that Lady Li be turned over, but Juqu Mujian refused and sent Lady Li away instead.