Jade Butterfly

Dark, light purple, melting yellow. Tao Ling's fence is beautiful, and Luo Han's house is fragrant. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ He was made a prince at the age of 5, but the reigning emperor was his cousin who was 16 years older than him. Why establish him?