《资治通鉴·汉纪·汉纪三十二》
刘秀怜悯刘杨谋反还没有行动就被诛杀，又封他的儿子刘德继任真定王。
帝怜杨谋未发而诛，复封其子为真定王。
Liu Xiu pitied Liu Yang who was executed before he even act on his treasonous plan, and he enfeoffed his son Liu De as the new King of Zhen Ding.