Emperor Xian of Han
In 1 BC, during the reign of Emperor Ai, the title was changed to "da si tu" (大司徒). In the Eastern Han dynasty, the chancellor post was replaced by the Three Excellencies: Grand Commandant (太尉), Minister over the Masses (司徒) and Minister of Works (司空). In 190, Dong Zhuo claimed the title "Chancellor of State" (相國) under the powerless Emperor Xian of Han, placing himself above the Three Excellencies. After Dong Zhuo's death in 192, the post was vacant until Cao Cao restored the position as "imperial chancellor" (丞相) and abolished the Three Excellencies in 208. From then until March 15, 220, the power of chancellor was greater than that of the emperor. Later this often happened when a dynasty became weak, usually some decades before the fall of a dynasty.