In ancient times, princes usually looked for Bandu between the ages of two and three. At this age, the prince's parents will start looking for suitable candidates for them. These people usually come from noble or official families and have certain cultural literacy and educational background. Prince Bandu's main duty is to help princes learn, accompany them to grow up and provide them with education and guidance. In ancient times, Prince Bandu was a very important and distinguished position, and the person who held this position usually needed a high degree of loyalty and responsibility.