Han Yu
In the miscellany "Miscellaneous Morsels from Youyang", Han Yu had an unnamed grandnephew who lived in the Huai River region. He instructed his grandnephew to study Confucian classics in a school, but his grandnephew showed no interest in his studies and bullied his classmates. Han Yu then arranged for his grandnephew to study in a Buddhist school, but the abbot complained that he was defiant and reckless. Han Yu then brought his grandnephew home and scolded him for not spending his time productively. However, his grandnephew claimed that he had the special ability to change the colour of peony flowers, and demonstrated it in front of him. Han Yu was greatly surprised. His grandnephew then returned to the Huai River region and led the rest of his life as a simple commoner.