Kamiizumi was using Nobutsuna before Takeda Shingen attacked. Name changing was common in that era, and it’s likely that the change to Nobutsuna was unrelated to Takeda Shingen. Spreading Shinkage-ryū After joining Nagano's service, Kamiizumi made a number of trips to Kyoto, then the capital. In 1558, he met a young Marume Nagayoshi there. While traveling to Kyoto in late 1563, he met Yagyū Munetoshi, and stayed in Yagyū Village for about half a year before arriving at the capital in 1564. During one of these trips, Kamiizumi and Marume demonstrated Shinkage-ryū to the shōgun Ashikaga Yoshiteru. Yoshiteru wrote a certificate of admiration, declaring Kamiizumi's school unparalleled in the land, and praising Marume's performance. The certificate is undated. Later, Kamiizumi would move to Kyoto, teaching Shinkage-ryū to various courtiers and noblemen of the Ashikaga Shogunate. Kamiizumi gathered a great many students. One source claims that he had 84 disciples with him when he went to Kyoto in 1564, and in the following year Kamiizumi himself claims in his certificate to Munetoshi that he had hundreds of disciples, presumably spread all over Japan at that time. Among his famous students are Yagyū Munetoshi, whose line of Shinkage-ryū exists to this day; Hikita Bungorō, Kamiizumi's nephew and founder of Hikita Kage-ryū; Hōzōin In'ei, a monk who founded Hōzōin-ryū sōjutsu; Marume Nagayoshi, founder of Taisha-ryū; Nonaka Shinkura, founder of Shin Shinkage Ichiden-ryū; and Komagawa Kuniyoshi, founder of Komagawa Kaishin-ryū. Later years and death A counselor in Kyōto named Yamashina Tokitsugu wrote in his diary that Kamiizumi came to the capital in 1570. He stayed with Yamashina for about two years, teaching Shinkage-ryū, and serving Yamashina. During this time he was known as Kamiizumi Musashi-no-kami Nobutsuna, or sometimes Ōgo Musashi-no-kami. In 1572 he visited Yagyū Village, and then traveled back to eastern Japan, with a letter of introduction from Yamashina to the Yuki clan in Shimōsa Province. The last known record of Kamiizumi is an entry in the records of Seirinji, a Soto Zen Buddhist temple in the town where Kamiizumi's family castle once stood. The record notes that Kamiizumi helped establish the temple in 1577, erecting a gravestone and paying for services. The temple still stands in Maebashi, Gunma Prefecture. It is not known when Kamiizumi died. One record notes that he died in 1572, but this is clearly contradicted by the Seirinji record noted above. Another record notes that he died in