In November 1919, Ueshiba learned that his father Yoroku was ill, and was not expected to survive. Leaving most of his possessions to Takeda, Ueshiba left Shirataki with the apparent intention of returning to Tanabe to visit his ailing parent. En route he made a detour to
Ayabe, near
Kyoto, intending to visit
Onisaburo Deguchi, the spiritual leader of the
Ōmoto-kyō religion (Ueshiba's nephew Noriaki Inoue had already joined the religion and may have recommended it to his uncle). Ueshiba stayed at the Ōmoto-kyō headquarters for several days, and met with Deguchi, who told him that, "There is nothing to worry about with your father". On his return to Tanabe, Ueshiba found that Yoroku had died. Criticised by family and friends for arriving too late to see his father, Ueshiba went into the mountains with a sword and practised solo sword exercises for several days; this almost led to his arrest when the police were informed of a sword-wielding madman on the loose. Within a few months, Ueshiba was back in Ayabe, having decided to become a full-time student of Ōmoto-kyō. In 1920 he moved his entire family, including his mother, to the Ōmoto compound; at the same time he also purchased enough rice to feed himself and his family for several years. That same year, Deguchi asked Ueshiba to become the group's martial arts instructor, and a dojo—the first of several that Ueshiba was to lead—was constructed on the centre's grounds. Ueshiba also taught Takeda's Daitō-ryū in neighbouring
Hyōgo Prefecture during this period. His second son, Kuniharu, was born in 1920 in Ayabe, but died from illness the same year, along with three-year-old Takemori. Takeda visited Ueshiba in Ayabe to provide instruction, although he was not a follower of Ōmoto and did not get along with Deguchi, which led to a cooling of the relationship between him and Ueshiba. Ueshiba continued to teach his martial art under the name "Daitō-ryū Aiki-jūjutsu", at the behest of his teacher. However, Deguchi encouraged Ueshiba to create his own style of martial arts, "Ueshiba-ryū", and sent many Ōmoto followers to study at the dojo. He also brought Ueshiba into the highest levels of the group's bureaucracy, making Ueshiba his executive assistant and putting him in charge of the Showa Seinenkai (Ōmoto-kyō's national youth organisation) and the Ōmoto Shobotai, a
volunteer fire service. His close relationship with Deguchi introduced Ueshiba to various members of Japan's far-right; members of the
ultranationalist group the
Sakurakai would hold meetings at Ueshiba's dojo, and he developed a friendship with the philosopher
Shūmei Ōkawa during this period, as well as meeting with
Nisshō Inoue and
Kozaburō Tachibana. Deguchi also offered Ueshiba's services as a bodyguard to
Kingoro Hashimoto, the Sakurakai's founder. Ueshiba's commitment to the goal of
world peace, stressed by many biographers, must be viewed in the light of these relationships and his Ōmoto-kyō beliefs. His association with the extreme right-wing is understandable when one considers that Ōmoto-kyō's view of world peace was of a
benevolent dictatorship by the
Emperor of Japan, with other nations being subjugated under Japanese rule. In 1921, in an event known as the , the Japanese authorities raided the compound, destroying the main buildings on the site and arresting Deguchi on charges of
lèse-majesté. Ueshiba's dojo was undamaged and, over the following two years, he worked closely with Deguchi to reconstruct the group's centre, becoming heavily involved in farming work and serving as the group's "Caretaker of Forms", a role which placed him in charge of overseeing Ōmoto's move towards self-sufficiency. His son
Kisshomaru was born in the summer of 1921. Three years later, in 1924, Deguchi led a small group of Ōmoto-kyō disciples, including Ueshiba, on a journey to
Mongolia at the invitation of retired naval captain Yutaro Yano and his associates within the ultra-nationalist
Black Dragon Society. Deguchi's intent was to establish a new religious kingdom in Mongolia, and to this end he had distributed propaganda suggesting that he was the reincarnation of
Genghis Khan. Allied with the Mongolian bandit
Lu Zhankui, Deguchi's group were arrested in
Tongliao by the Chinese authorities. Fortunately for Ueshiba, whilst Lu and his men were executed by firing squad, the Japanese group was released into the custody of the Japanese consul. They were returned under guard to Japan, where Deguchi was imprisoned for breaking the terms of his bail. During this expedition Ueshiba was given the Chinese alias Wang Shou-gao, rendered in Japanese as "Moritaka" – he was reportedly very taken with this name and continued to use it intermittently for the rest of his life. After returning to Ayabe, Ueshiba began a regimen of spiritual training, regularly retreating to the mountains or performing
misogi in the
Nachi Falls. As his prowess as a martial artist increased, his fame began to spread. He was challenged by many established martial artists, some of whom later became his students after being defeated by him. In the autumn of 1925 he was asked to give a demonstration of his art in Tokyo, at the behest of Admiral
Isamu Takeshita; one of the spectators was
Yamamoto Gonnohyōe, who requested that Ueshiba stay in the capital to instruct the
Imperial Guard in his martial art. After a couple of weeks, however, Ueshiba took issue with several government officials who voiced concerns about his connections to Deguchi; he cancelled the training and returned to Ayabe. ==Tokyo, 1927–1942==