Zenmyōshō-in is a Koyasan Shingon Buddhist temple located in Kudoyama, Wakayama Prefecture. It is said to be the site of a hermitage where Sanada Masayuki and Nobushige (Yukimura) lived in seclusion, although there are various theories. It is designated as a historical site of Wakayama Prefecture. It is also known as Sanada-an. It is also famous as a place for peonies, and the eight-roofed structure of the castle-like main hall is also well-known. I received only a written goshuin (temple stamp) as the chief priest was absent. There were no explanatory documents or goshuin bags. <Sanada-an> This temple stands on the site of the residence where the Sengoku warlords Sanada Yukimura and his father Masayuki lived in hiding. Sanada-an (Zenmyōshō-in) was built on the site of the Sanada residence. Sanada Yukimura was ordered to live in seclusion on Mount Koya and lived in Kudoyama. Within the temple grounds, there is Sanada Daigongen, where Sanada Masayuki is enshrined as a god, as well as a stone monument with a haiku by Basho about the Sanada clan. Also within the grounds, there is the "Lightning Sealing Well," which is said to have been where Sanada Yukimura trapped fallen lightning to save the villagers. In addition, this temple itself enshrines the Enmei Koyasu Jizo-son (a Jizo statue for longevity and safe childbirth) and is a temple that is deeply familiar to the local community.