Database: Kamiizumi Nobutsuna

Kamiizumi Nobutsuna, a warrior from the Sengoku period, hailed from Kōzuke in northern Kantō and is renowned as a pivotal figure in kenjutsu, the art of the sword. He is celebrated for founding the Shinkage-ryū (New Shadow School). Many historical and contemporary sword schools claim his teachings; however, like many foundational figures, his biography is subject to various episodes recounted much later and not always from credible sources. Both his birth and death dates remain uncertain.

Nobutsuna is believed to have been born in 1506 at the family manor near Mount Akagi, where he grew up. As an adult, he appears to have served several prominent daimyōs, including Hōjō Ujiyasu, Uesugi Kenshin, and Takeda Shingen. In 1564 (or possibly 1570, according to other sources), he traveled to Kyoto, where his demonstration before the shōgun left a significant impression. Consequently, he gained numerous disciples among the warriors, including Lord Yagyū Munetoshi, to whom he imparted his art and granted the "teaching rights" of the Shinkage-ryū, the new sword school he had founded. This school later became associated with the Yagyū name and was established as the official sword school of the Tokugawa shoguns in the 17th century. Additionally, Kamiizumi Nobutsuna had significant ties to Zen Buddhism, to which he was devoted from a young age. Various texts provide conflicting accounts of his death, suggesting the years 1577 or 1582. He is also known by several names, including Kamiizumi Ise no Kami and Ōgo Musashi no Kami.