Ryukoin Temple is a historic Shingon Buddhist temple located on Mount Koya in Koya Town, Wakayama Prefecture. Known as one of the special head temples of Koyasan Shingon Buddhism, it has played an important role in the religious history of Mount Koya for centuries.
Surrounded by the quiet and sacred atmosphere of Mount Koya, Ryukoin is one of the area’s distinguished temples, with a long history and deep connections to Japanese Buddhist faith. The temple’s principal object of worship is Dainichi Nyorai, or Mahavairocana Buddha, one of the central figures of Esoteric Buddhism. Dainichi Nyorai symbolizes the fundamental truth of the universe and is deeply revered within the Shingon Buddhist tradition.
Ryukoin is traditionally said to have been one of the places where Kobo Daishi Kukai stayed when he was establishing the sacred Buddhist center of Mount Koya. In earlier times, the site was known as Chuin, meaning the “Central Temple.” This name reflects the important position the temple once held within the religious community of Mount Koya.
During the late Heian period, the monk Myosan came to the site and changed its name to Ryukoin. From that time onward, the temple continued to develop over many centuries.
At its height, Ryukoin is said to have possessed extensive temple estates and numerous subordinate temples. It therefore held considerable influence not only in religious matters but also in the economic and social life of Mount Koya.
The temple’s long history is closely intertwined with the development of Shingon Buddhism and the spiritual traditions that have continued on Mount Koya for more than a thousand years.
Ryukoin is also known by the intriguing name “Temple of the Master’s Wet Straw Sandals.” According to tradition, this name comes from the fact that Kobo Daishi frequently traveled back and forth through the area while engaged in Buddhist practice.
The temple’s present name is also associated with a fascinating legend involving a mysterious dragon.
According to tradition, during the time of Myosan Da toku, the 16th head priest and an important figure in the temple’s revival, a mysterious event took place in a pond within the temple grounds.
A divine dragon is said to have emerged from the pond while carrying a sacred jewel in its mouth or upon its head. The dragon then ascended into the heavens.
This extraordinary event was regarded as an auspicious sign indicating the protection of the Buddhist teachings. It was said to be because of this miraculous occurrence that the temple came to be called Ryukoin, a name associated with the light and presence of a dragon.
Legends such as this add a mysterious dimension to the temple’s history and help convey the spiritual world that has long surrounded Mount Koya.
One of the distinctive characteristics of Ryukoin today is that the temple is not generally open to the public for sightseeing. Visitors cannot normally enter the temple buildings for general viewing.
Although this may make Ryukoin different from the more widely visited temples of Mount Koya, its restricted access also preserves the solemn atmosphere of a place dedicated to Buddhist practice and religious life.
Even from outside, visitors can sense the quietness and historic character of the temple. Rather than being a conventional tourist attraction, Ryukoin offers an opportunity to reflect on the many temples on Mount Koya that continue to exist primarily as places of faith and practice.
When exploring Mount Koya, paying attention to such temples can provide a deeper understanding of the mountain’s spiritual culture. Not every important religious site is open for sightseeing, and this distinction is an important part of understanding Mount Koya as a living sacred place.
Although Ryukoin is not generally open for public viewing, the temple is known for preserving a remarkable collection of valuable Buddhist artworks, scriptures, statues, and ritual objects.
Many of these works are extremely important for understanding the history of Japanese Buddhism, religious art, calligraphy, and Esoteric Buddhist traditions.
The temple’s collection includes several works designated as National Treasures of Japan, including:
・Painted Silk Image of the Kannon Appearing from a Boat, traditionally attributed to the late Heian period
・Konkomyo Saisho-o-kyo (The Sutra of Golden Light), written in gold characters on purple paper, 10 scrolls
・Large-Character Lotus Sutra, 7 scrolls
・Small-Character Konkomyo Saisho-o-kyo, 2 scrolls
These treasures provide valuable insight into the religious beliefs, artistic techniques, and sophisticated aesthetics of medieval Japan.
In particular, the beautifully written Buddhist scriptures demonstrate the importance placed on the copying and preservation of sacred texts. They also reflect the high level of craftsmanship and calligraphic skill that developed alongside the spread of Buddhism in Japan.
Ryukoin also preserves numerous works designated as Important Cultural Properties. The collection covers a wide range of Buddhist art and religious objects, including paintings, statues, ritual implements, and other treasures.
Among them are:
・Painted Silk Image of Kariba Myojin
・Painted Silk Mandala of the Two Realms
・Wooden Standing Statue of Tobatsu Bishamonten
・Kurikara Dragon Sword in a Buddhist Shrine
・Buddhist Initiation Ritual Implements, along with many other works
These objects are important sources for understanding the rituals, beliefs, and visual culture of Esoteric Buddhism.
The breadth and historical importance of the collection demonstrate that Ryukoin is not simply an old temple. It is also a significant religious and cultural center for the study and preservation of Japanese Buddhist heritage.
Ryukoin is not a temple designed as a conventional tourist attraction. Nevertheless, its very presence contributes to the distinctive character of Mount Koya.
While some of the mountain’s temples are famous for spectacular architecture, gardens, or visitor experiences, Ryukoin quietly preserves its history away from the main flow of sightseeing. Its reserved atmosphere can encourage visitors to think about what faith means and how religious traditions have survived through the centuries.
Mount Koya is home to famous destinations such as Danjo Garan and Okunoin, but its spiritual character is also created by the many historic temples that continue their religious activities away from public view.
Ryukoin represents this less visible side of Mount Koya. Even when visitors cannot enter the temple, knowing its history and looking upon its surroundings with respect can make a journey through the mountain more meaningful.
Ryukoin Temple is a historic temple deeply connected with the origins and development of Mount Koya. Its traditions link it to Kobo Daishi Kukai, while its mysterious dragon legend adds an intriguing spiritual dimension to its history.
The temple is also remarkable for its collection of National Treasures and Important Cultural Properties, which preserve important examples of Japanese Buddhist art, scriptures, ritual objects, and religious culture.
Although general public admission is not available, this does not diminish the temple’s importance. Rather, its quiet presence reminds visitors that Mount Koya is not simply a sightseeing destination, but a living center of Buddhist faith and practice.
When visiting Mount Koya, take time to appreciate not only its famous attractions but also the historic temples that quietly preserve centuries of religious tradition. By looking beyond the places that are open to sightseeing, travelers can discover a deeper and more contemplative side of this extraordinary sacred mountain.