Answer
Onisaburo Deguchi, the founder of the Omotokyo religious movement, accompanied Ueshiba on his journey to Mongolia. Ueshiba sought spiritual guidance and martial arts training during this trip, which profoundly influenced the development of his martial art, Aikido. Deguchi's teachings on spiritual cultivation and the harmonization of mind, body, and spirit resonated deeply with Ueshiba and contributed to the philosophical underpinnings of Aikido.