Zhu Youzhen
In 913, Zhu Yougui's younger brother Zhu Youzhen the Prince of Jun overthrew Zhu Yougui and took the throne himself (and then changed his name to Zhu Zhen). He tried to placate Gao by creating Gao the Prince of Bohai. However, Gao still began to build a fleet that eventually grew to 500 ships, and further enhanced his defenses and the soldiers' armors and weapons. Further, he began to enter into diplomatic communications with Former Shu and Wu, with the Later Liang imperial government unable to stop him.