In the spring of 1333, the Emperor Go-Daigo and his supporters believed that the moment had arrived to restore the glory of the imperial court. The Emperor Daigo (AD 901–923), who lived at a time when the court had no rivals and effective rule was exercised directly from the throne, became Go-Daigo's adopted name and model. Of cardinal importance was the ideology that emerged with the Kemmu Restoration: it was a conscious movement to restore the imperial power vis-a-vis the warriors. Two of the movement's greatest spokesmen were Prince Morinaga and Kitabatake Chikafusa. Prince Morinaga was Daigo's son, and archrival to Ashikaga Takauji: he advocated the militarization of the nobles as a necessary step towards effective rule. Kitabatake Chikafusa epitomized what Prince Morinaga was looking for: a Kyoto noble who became the greatest of the imperialist generals, combining the ways of the warrior to his noble upbringing. During the long siege in Hitachi (1338–43), Chikafusa wrote the Jinnō Shōtōki, one of the most influential works on the legitimacy of the Japanese imperial system ever written. This became one of the ideological bases of the Meiji Restoration of the 19th century.