In 1413 Date Mochimune (伊達持宗) shut himself inside Daibutsu Castle (大仏城) in defiance of the Kamakura kubō. This is the first known historical mention of Daibutsu Castle, which was near the confluence of the Abukuma and Arakawa rivers at the present-day location of the Fukushima Prefectural Offices. It is said that the castle was named after the "Suginome Great Buddha" (杉妻大仏, Suginome Daibutsu), a Vairocana Buddha statue kept within the castle. The castle was also known as Suginome Castle (杉妻城). It is believed that in this time period the area's name was changed from Minekoshi to Suginome (杉妻) to reflect the concentration of political power in the area.