주공
According to the Records of the Grand Historian, one day, King Cheng of Zhou was playing with his younger brother, Prince Yu. King Cheng of Zhou suddenly picked up a parasol tree leaf and gave it to Prince Yu. Then he said playfully," Let this be a proof that I will make you a feudal lord." Prince Yu happily got the leaf and he then told this to the Duke of Zhou. The Duke of Zhou thought that whatever the young King Cheng of Zhou said should not be taken lightly since he was the king.