Wudi
By 422, Emperor Wu was ill. His official Xie Hui saw that Crown Prince Yifu was often spending time with people lacking in abilities and virtue, and warned Emperor Wu about it. Emperor Wu considered making Liu Yizhen the Prince of Luling crown prince instead. Xie, however, after meeting with Liu Yizhen, had an even worse opinion of Liu Yizhen, and so Emperor Wu stopped considering so.