Empress Lü Zhi
Subsequently, Zhang Liang retired from state affairs and practised Taoism. In late 201 BC, Gaozu rewarded his subjects who contributed to the dynasty's founding and he conferred the title of "Marquis of Liu" on Zhang Liang. In 196 BC, Gaozu left to suppress a rebellion by Ying Bu, and requested Zhang Liang to come out of retirement to assist the crown prince, Liu Ying, in governing the home territories. After returning from the campaign, Gaozu wanted to replace Liu Ying with Liu Ruyi, the Prince of Zhao. Zhang Liang opposed Gaozu's decision but Gaozu ignored him so Zhang feigned illness and retired again. When approached by Empress Lü Zhi to help Liu Ying retain his position, Zhang Liang recommended the Four Whiteheads of Mount Shang to help Liu Ying, and the four men succeeded in convincing Gaozu to keep Liu Ying as the crown prince. Zhang Liang remained in retirement until his death in 186 BC.