in itself was in effect a miniature shogunate, this event can be considered the beginning of the Ashikaga shogunate. In 1335, during the Nakasendai Rebellion led by Hōjō Tokiyuki Tadayoshi, being unable to defend the city, had to leave Kamakura in a rush. Not being in the position to take along another son of Go-Daigo's, Prince Morinaga, whom he had kept as a hostage for several months, rather than letting him go he decided to have him beheaded. In Dec. 1335, Tadayoshi was defeated by imperial forces under the command of Nitta Yoshisada forcing his retreat to the Hakone mountains. However, with the aid of his brother Takauji, they were able to defeat Yoshisada at the battles of Sanoyama and Mishima. The brothers were then free to advance upon Kyoto. Their occupation of Kyoto was short lived however, as forces loyal to Go-Daigo forced the brothers to flee west. In April 1336, Ashikaga Tadayoshi, "drove the enemy before him" helping his brother defeat the Kikuchi clan, allies of Go-Daigo. This Battle of Tatarahama (1336) occurred in Hakata Bay. The victory enabled Takauji to become master of Kyushu. By May, Takauji was able to advance with a flotilla, reaching the environs of present-day Kobe in July. Tadayoshi followed in parallel with a land force. Turning against Go-Daigo, Tadayoshi and Takauji set up a rival emperor in 1336 after defeating the Loyalists in the Battle of Minatogawa. Their Muromachi shogunate was founded in 1338. Dividing power between them, Takauji took charge of military affairs and Tadayoshi of judicial and administrative matters. Both Tadayoshi and Takauji were disciples of famous Zen master, intellectual and garden designer Musō Soseki, under which guidance the first would later become a Buddhist monk. It was partly because of Soseki's influence that the pre-existing Five Mountain System network of Zen temples was expanded and strengthened, first with the establishment of the Jissetsu, and later with that of the Ankoku-ji temple sub-networks. The creation of both systems is generally attributed wholly to Tadayoshi. It was also Soseki which famously wrote about the two brothers, describing Takauji as more apt to military pursuits, and Tadayoshi to government. The Kannō disturbance and Tadayoshi's death Ashikaga Takauji was the formally-appointed shogun but, having proved incapable of ruling the country (namely, Northern Court), for more than ten years Tadayoshi had governed in his stead. The relationship between the two brothers was however destined