During the reign of Mu Rongchui, Murong De was made Duke Liang. Later, Mu Rongchui's son Mu Rongchui succeeded to the throne and changed his name to King john young. In 369, he and Mu Rongchui defeated the attack of Huan Wen in the Eastern Jin Dynasty. In 370, after Yan Qian was destroyed by the former Qin Dynasty, he was appointed as the magistrate of Zhangye by the former Qin Emperor Fu Jian, and was dismissed several years later.
Later, Fu Jian wanted to March south to the Eastern Jin Dynasty, and Murong De was appointed as the general's army, leaving a golden knife to bid farewell to his mother Gongsun and another brother Murong Na. In 383, the former Qin Dynasty was defeated in the battle of fertilizer and water, and Mu Rongchui took the opportunity to establish Houyan. Murong De responded, was ordered to be a general riding chariots, and was renamed King john young. But all his sons and Murong Na were killed by the former Qin because they stayed in the rear.
In 396, Mu Rongchui was critically ill and ordered Prince Murong Bao to be guarded by Murong De. After Murong Bao succeeded to the throne, he took Murong De as the ambassador, held a ceremony, and served as the military commander-in-chief. He specially planned to ride horses and graze generals in six States of Hebei, Yanzhou, Qinghai, Xu, Jing and Henan, and led a captain of Nanman to guard Yecheng.
In 397, the Northern Wei Dynasty attacked Houyan, and Houyan suffered a crushing defeat. Emperor Murong Bao fled to his hometown in the north, and the territory of Houyan was divided into two parts. Murong De, located in the south, was appointed as prime minister by Murong Bao and led Jizhou to graze. Soon, another son of Mu Rongchui, Murong Lin, the prince of Zhao, fled to Yecheng, which was difficult to keep, and suggested that Murong De move south to slide. In 398, Murong De was suggested by Murong Lin to be called the Prince of Yan first. In the first year of the Prince of Yan, this regime was known as Southern Yan in history. The following year, I moved to Optics Valley and thought it was the capital.
In 400, Murong De officially proclaimed himself emperor and changed his name to Yuan Jianping. At this time, he changed his name to Murong Bede, so that his subjects could avoid it. Murong De has a daughter but no children, and is in urgent need of a successor. Murong Chao, the son of his brother Murong Na, came back with Murong De's golden knife when he left his mother, so Murong De named this nephew Prince. Murong De was 65 when he officially ascended the throne, second only to Wu Zetian in the Tang Dynasty in China history, and Wu Zetian was 67 when he ascended the throne.
In the sixth year of Jianping, Murong De died and Murong Chao succeeded to the throne. On the night of his death, more than ten coffins were carried out from the square gate and buried in the valley. So in fact, he was not buried in Dongyang Mausoleum, his mausoleum, and later generations don't know where he was buried. Murong De was later named Emperor Wu De, with the temple number Sejong.