The was a three-year period of Imperial rule in Japanese history between the Kamakura period and the Muromachi period from 1333 to 1336. The Kenmu Restoration was an effort made by Emperor Go-Daigo to overthrow the ruling Kamakura Shogunate (de facto ruled by Hōjō clan) and restore the Imperial House to power in Japan, returning to civilian government after 148 years of de facto military government from Kamakura. Go-Daigo launched the Genkō War in 1331 against the Kamakura Shogunate but was defeated and forced to exile to the Oki Islands. Go-Daigo launched a second uprising, and with the assistance of the defected Kamakura general Ashikaga Takauji and rebel leader Nitta Yoshisada, defeated the Kamakura Shogunate at the siege of Kamakura in 1333. The Imperial House was restored to power but Go-Daigo's policies failed to satisfy his major samurai supporters and most Japanese people. By the end of 1335 the Emperor and the nobility had lost all support of the warrior class. The appointment of a warrior to an important post was intended to show the Emperor that the samurai class was not ready for a purely civilian rule. Takauji believed the military class had the right to rule and considered himself not a usurper but, since the Ashikaga descended from a branch of the Minamoto clan, rather a restorer of Minamoto power. When invited to return to Kyoto, he let it be known through his brother Tadayoshi that he felt safer where he was, and started to build himself a mansion in Ōkura, where first Kamakura shōgun Minamoto no Yoritomo's residence had been.