Katsuhitakamori Shrine stands near the summit of Mount Gassan in Hirosecho, Yasugi City, Shimane Prefecture. Revered since ancient times as a guardian deity of the area, the shrine now stands near the former main enclosure of Gassan Toda Castle, one of Japan’s most famous mountain castles.
The shrine is traditionally believed to have existed before Gassan Toda Castle was built. In ancient times, Katsuhitakamori Shrine was located near the summit as the mountain shrine, while Katsuhi Shrine served as the shrine at the foot of the mountain. The area is particularly fascinating because Japanese mythology and the history of the Warring States period come together in one sacred landscape.
Mount Gassan has long been associated with two shrines. At the foot of the mountain, Katsuhi Shrine enshrines Onamuchi-no-Mikoto, while Katsuhitakamori Shrine near the summit enshrines Okuninushi-no-Mikoto.
Onamuchi-no-Mikoto and Okuninushi-no-Mikoto are often regarded as the same deity under different names. Okuninushi is one of the most important figures in the mythology of the Izumo region and is traditionally associated with the creation and development of the land.
The presence of shrines at both the foot and summit of Mount Gassan suggests that the mountain has been regarded as a sacred place since ancient times.
The Kojiki, Japan’s oldest surviving historical record, contains a famous story concerning Okuninushi-no-Mikoto and the creation of the land. While Okuninushi was working to establish the land, his companion Sukunahikona-no-Mikoto departed for the distant land of Tokoyo. Left without his important partner, Okuninushi wondered how he could continue his work.
At that moment, a mysterious divine light appeared across the sea. The deity within the light offered guidance to Okuninushi and told him how to continue creating and governing the land.
When Okuninushi asked the deity’s identity, the deity replied that it was his “Sakimitama and Kushimitama”, sacred aspects of his own spirit. According to tradition, this divine presence appeared at Mount Gassan.
The mountain consequently came to be regarded as a sacred place. Tradition holds that Onamuchi-no-Mikoto was enshrined at Katsuhi Shrine at the foot of the mountain, while Okuninushi-no-Mikoto was enshrined at Katsuhitakamori Shrine near the summit.
Another fascinating legend connects the mountain with Taira no Kagekiyo, a warrior of the late Heian period. Kagekiyo is famous for his role in the Genpei War, and according to local tradition, he later came to Izumo and decided to build a castle on Mount Gassan.
However, a shrine already stood on the site where he planned to construct the castle. Rather than destroying a sacred place, Kagekiyo is said to have decided to move the shrine elsewhere so that it would not be damaged if fighting broke out around the castle.
According to the legend, Kagekiyo climbed to the summit of Mount Gassan one night. He placed a white-feathered arrow on his bow and shot it into the night sky, deciding that the place where the arrow landed would be the location indicated by the gods.
The following morning, he searched in the direction in which the arrow had flown. He eventually found it deeply embedded in a pine tree some distance away. Believing this to be a sign from the gods, he moved the shrine to that location.
The site is traditionally identified with today’s Tomita Hachimangu Shrine. The pine tree into which the arrow was said to have struck became known as Yatate-no-Matsu, meaning the “Pine of the Arrow.” The current tree is considered the fourth generation, and visitors can still look toward the summit of Mount Gassan from the shrine grounds.
The arrow attributed to Kagekiyo is also traditionally preserved as a sacred treasure of Tomita Hachimangu Shrine. Its arrowhead, said to have remained deeply embedded in the target, serves as a vivid reminder of the strength and martial traditions associated with the legend.
During the Warring States period, Mount Gassan became the center of Gassan Toda Castle, an enormous mountain fortress. Built around the approximately 190-meter-high Mount Gassan, the castle made clever use of the mountain’s steep natural terrain as part of its defenses.
The main enclosure was located near the summit, surrounded by the second and third enclosures. Numerous kuruwa, or fortified enclosures, were arranged along the mountain slopes. These defensive areas were positioned at different levels, allowing defenders to resist attackers repeatedly as they advanced up the mountain.
There were only three principal approaches to the castle: Sugatani-guchi, Okamori-guchi, and Shiotani-guchi. The mountain also featured a steep path known as Nanamagari, or “Seven Bends,” where defenders could attack enemies climbing from below.
Thanks to this sophisticated defensive layout and its difficult mountain terrain, Gassan Toda Castle became renowned as an extremely difficult fortress to conquer.
Gassan Toda Castle flourished as the stronghold of the Amago clan, a powerful warrior family that expanded its influence across the Chugoku region during the Warring States period.
Under Amago Tsunehisa, the clan grew into a major regional power controlling large areas of the San’in and San’yo regions. Gassan Toda Castle served as the political and military center of the Amago domain.
The castle later became the scene of fierce battles involving the Ouchi clan and the Mori clan, yet it survived repeated attacks. The legendary warrior Yamanaka Shikanosuke is also closely associated with the castle and the final years of the Amago clan.
After the Amago clan fell, the castle came under the control of the Mori and Kikkawa clans. In the early Edo period, the Horio clan also occupied the castle. When the Horio clan moved its base to Matsue Castle in 1611, Gassan Toda Castle was abandoned.
Today, the ruins of Gassan Toda Castle have been preserved as a historic site and are open to visitors. The castle ruins were designated a National Historic Site in 1934 and were selected as one of Japan’s 100 Famous Castles in 2006.
From the upper sections of the mountain, visitors can look across the town of Hirose and follow the course of the Iinashi River below. The landscape makes it possible to imagine how the castle and its surrounding castle town were arranged during the Warring States period.
Walking through the ruins, surrounded by mountain paths, stonework, and historic fortifications, offers a strong sense of the site’s past and its strategic importance.
Katsuhitakamori Shrine has long been revered as a guardian shrine of Mount Gassan and the castle. Today, it stands quietly near the former main enclosure, continuing to watch over the mountain and its long history.
Visiting the shrine while exploring the castle ruins allows travelers to experience layers of Japanese history, from ancient mythology and Shinto traditions to the turbulent age of samurai warfare and the present day.
The combination of forest-covered mountain trails, sacred sites, and historic castle remains makes Mount Gassan an appealing destination for travelers interested in Japanese history, mythology, hiking, and cultural heritage.
By car: Approximately 15 minutes from Yasugi Interchange.
By bus: From JR Yasugi Station, take the Yellow Bus on the Hirose–Yonago Line and get off at the Gassan Iriguchi bus stop. The journey takes approximately 30 minutes.
By taxi: Approximately 20 minutes from JR Yasugi Station.
Mount Gassan is a remarkable place where an ancient sacred landscape and the history of one of Japan’s most formidable mountain castles come together. Katsuhitakamori Shrine preserves the spiritual traditions of the mountain, while the ruins of Gassan Toda Castle reveal the political and military history of the Warring States period.
For travelers exploring Shimane, a visit here offers an opportunity to experience a distinctive side of Japanese culture, where mythology, Shinto traditions, samurai history, and mountain scenery are woven together in a single historic landscape.