Takeda Sōkaku (武田 惣角; October 10, 1859 – April 25, 1943) was known as the founder of a school of jujutsu known as Daitō-ryū Aiki-jūjutsu. His nickname was The Little Tengu of Aizu and he was known as Minamoto no Masayoshi (源正義).
Source: “Takeda Sōkaku”, English Wikipedia (CC BY-SA 4.0), excerpt