Gao Zhao
In 504, Emperor Xuanwu's uncle Yuan Xiang (元詳) the Prince of Beihai, who was then prime minister, grew increasingly arrogant and corrupt. Yuan Xiang had an affair with a cousin of Gao Zhao, who was the wife of Yuan Xie (元燮, not the same person as the Prince of Pengcheng) the Prince of Anding, and through her Gao apparently became aware of Yuan Xiang's crimes, and so he used the evidence of those crimes to further accuse Yuan Xiang of plotting treason. Emperor Xuanwu stripped Yuan Xiang of his title and posts, and Yuan Xiang soon thereafter died, and his associates were executed. Gao further suggested Emperor Xuanwu to put the imperial princes under heavy guard, and, despite opposition from Yuan Xie the Prince of Pengcheng, Emperor Xuanwu agreed, effectively putting those princes under house arrest.