Takeda Ayasaburō
Takeda Ayasaburō (武田 斐三郎, November 4, 1827 - January 28, 1880), was a Japanese Rangaku scholar, and the architect of the fortress of Goryōkaku in Hokkaidō. Takeda was born in the Ōzu Domain (modern-day Ōzu, Ehime) in 1827. He studied medicine, Western sciences (rangaku), navigation, military architecture. He was a student of Ogata Kōan and Sakuma Shōzan. In 1854 he was ordered to the island of Hokkaidō to reinforce the military infrastructure.