* Image is for illustrative purposes only.Iwadeyama Castle
岩出山城
Iwadeyama Castle is a historic castle in Tōhoku dating from the Founded in the Muromachi period (Ōei era); rebuilt and renamed by Date Masamune in 1591, whose lord was Ujiie clan (founders); Date Masamune; the Iwadeyama-Date family (Date Munayasu and successive heads).
Overview
Founding
Iwadeyama Castle is traditionally said to have been built as "Iwatezawa Castle" in the Ōei era (1394–1428) by Ujiie Naomasu, a senior retainer of the Ōsaki clan. Sited on high ground overlooking the Egō River, it served as one of the strongholds controlling the Ōsaki region.
Date Masamune's Base
In 1591, Date Masamune, ordered by Toyotomi Hideyoshi's reorganization of Ōshū to relocate his base from Yonezawa, took up residence at what was then Iwatezawa Castle. Sakakibara Yasumasa, acting on instructions from Tokugawa Ieyasu, revised the castle's layout, and Masamune renamed the place "Iwadeyama." For the twelve years until he moved to Sendai Castle in 1603, Masamune used this castle as his base while preparing to found the city of Sendai. After his transfer, his fourth son, Date Munayasu, was granted a stipend of 15,000 koku and founded the Iwadeyama-Date family, whose successive heads resided at the castle site until the Meiji Restoration.
Structure
As a mountain castle, it had no main keep; earthworks, dry moats, cut-throughs (horikiri), and gate approaches (koguchi) with stonework survive among the bailey remains. From the early modern period onward, its character shifted toward that of a jin'ya (administrative seat) for a subdivided fief of the Date house.
Connection to Swords
Masamune, who made this castle his base for twelve years, was famed as an avid lover of Japanese swords — tradition holds that he would even inspect his retainers' blades at drinking banquets. The celebrated swords he treasured throughout his life, including "Shokudaikiri Mitsutada," bestowed on him by Toyotomi Hideyoshi, and "Ōkurikara," said to have always accompanied him on campaign, are remembered as part of the warrior life he led, including his years at Iwadeyama.
Present State
The castle site is maintained as Shiroyama Park, preserving earthworks and dry moats. A peace statue of Date Masamune by the sculptor Yanagihara Yoshitatsu stands within the grounds. The Yūbikan, a domain school once located within the castle precinct, along with its garden, is a National Historic Site as Japan's oldest surviving domain-school building.
Connection to Swords
Date Masamune, who made this castle his base for twelve years, was renowned throughout his life as a lover of swords, and numerous anecdotes surround his celebrated blades, including "Shokudaikiri Mitsutada," bestowed on him by Toyotomi Hideyoshi, and "Ōkurikara," said to have always been at his side. These stories are inseparable from Masamune's career as a warrior during his Iwadeyama years.
Highlights
- Mountain castle where Date Masamune based himself for 12 years before founding Sendai
- The adjacent Yūbikan domain school and garden — Japan's oldest surviving domain-school building — is a National Historic Site
- Earthworks, dry moats, and cut-throughs (horikiri) survive within Shiroyama Park
- Associated with the traditions surrounding Masamune's celebrated swords, including Shokudaikiri Mitsutada and Ōkurikara
* Opening hours and admission fees are subject to change. Please check the official website before visiting.