Justin (about 328-376), whose original name was Yuan Hu, was Yan Bo. Metaphysics scholar, writer and historian in the Eastern Jin Dynasty. Chen Jun was born in Yang Xia (now Taikang, Henan). At first, he joined the army as Xie An. Later, he served as the editing room of Huan Wen and became the magistrate of Dongyang. Because he was dissatisfied with several books of the later Han Dynasty that had been published at that time, Xun Yue compiled the Records of the Han Dynasty, followed by the Book of the Later Han Dynasty, and wrote three volumes of articles such as Biography of Bamboo Forest Celebrities, Ode to the Eastern Expedition and Ode to the Northern Expedition. There are thirty volumes of the Book of the Later Han Dynasty. Taiyuan died in his early years.