Unveiling the Legend of Kumokiri: The Spider-Cutter Sword
Japan is a land where history and mythology bleed into one another, creating a tapestry of folklore that continues to captivate the world. Among the most enduring legends are those of the samurai and their legendary blades. While many know of the katana simply as a weapon of war, specific swords in Japanese history hold spiritual significance, believed to possess the power to banish evil. Foremost among these is the Kumokiri (Spider-Cutter), the legendary blade wielded by the demon-slayer Minamoto no Yorimitsu.
Also known as Raikō, Yorimitsu is a figure who straddles the line between historical general and mythological hero. His encounter with the Tsuchigumo (Earth Spider) and the sword he used to defeat it remain one of the most popular tales in Japanese culture today.
Origins: The Blade Known as Hizamaru
The sword that would eventually be known as Kumokiri did not start with that name. According to the lore surrounding the Genji (Minamoto) clan, this blade was one of two heirlooms commissioned by the clan, the other being Higekiri (Beard-Cutter).
Traditionally, the sword was first named Hizamaru (Knee-Cutter). The name was derived from a gruesome test of sharpness: when used to execute a criminal, the blade was so sharp that it cut through the victim’s neck and severed the knees in a single stroke. As the sword passed down through the Minamoto lineage, its name changed based on the supernatural feats it performed. It was known as Hoemaru (Barking Circle) because it allegedly barked at night to warn of danger, before finally earning its most famous moniker: Kumokiri.
The Legend of the Tsuchigumo
The transformation of the sword’s identity is anchored in a chilling tale from the Heian period. The legend begins with Minamoto no Yorimitsu, a powerful warrior renowned for his bravery, falling unexplainably ill in Kyoto. As he lay bedridden with a high fever, he was plagued by nightmares and a sense of oppression.
One night, a strange, towering monk appeared in his sickroom, looming over him with intent to kill. Despite his weakened state, Yorimitsu’s warrior instincts kicked in. He grabbed his sword, Hizamaru, which rested by his pillow, and struck the shadowy figure with lightning speed. The monk shrieked and vanished, leaving behind only a trail of blood.
The next morning, Yorimitsu and his loyal retainers, the Four Guardian Kings (Shitenno), followed the blood trail. It led them deep into the mountains to a strange mound or cave. Inside, they discovered a monstrous Tsuchigumo—a giant Earth Spider of terrifying proportions. The spider revealed that it had been the source of the curse plaguing the capital and Yorimitsu. Realizing the creature was wounded by the previous night’s strike, Yorimitsu and his men finished the beast off. Because the sword had successfully wounded the supernatural spider, Yorimitsu renamed it Kumokiri (Spider-Cutter) in honor of the victory.
Impact on Modern Culture
The legend of Raikō and his Spider-Cutter has permeated Japanese pop culture for centuries. Originally a staple of Noh and Kabuki theater—specifically the famous play Tsuchigumo—the story has evolved for modern audiences.
In the realm of anime and video games, the sword and its master appear frequently. Fans of the Fate franchise (Fate/Grand Order) recognize Minamoto no Raikō as a powerful servant, often depicted wielding weapons inspired by her legend. Similarly, the concept of demon-slaying swords is central to the global hit Demon Slayer: Kimetsu no Yaiba, which draws heavy inspiration from the lore of the Heian period demon hunters. The action RPG Nioh 2 also features the combat against the Tsuchigumo, allowing players to relive the myth kinetically.
Traveler’s Tips: Tracing the Legend in Kyoto
For travelers visiting Japan, the legend of the Spider-Cutter is not just a story; it is a journey you can physically trace in Kyoto.
1. Daikaku-ji Temple
Located in the Arashiyama district, this temple has deep ties to the imperial family and the Heian court. It is often the home of the sword identified as Hizamaru (Kumokiri). While the sword is not always on public display due to preservation concerns, the temple frequently holds special viewings, particularly in autumn. It is a pilgrimage site for sword enthusiasts (known as touken joshi).
2. Kitano Tenmangu Area
Just a short walk from the famous Kitano Tenmangu Shrine is a small, unassuming stone monument known as the Tsuchigumo-zuka (Mound of the Earth Spider). According to local folklore, this is the very spot where the spirit of the spider rests. It is a quiet, somewhat eerie reminder of the supernatural history lurking beneath modern Kyoto.
3. Seimei Shrine
Dedicated to Abe no Seimei, the legendary Onmyoji (yin-yang master) who lived during the same era as Yorimitsu, this shrine captures the mystical atmosphere of the Heian period. While not the home of the sword, it provides crucial context to the world of demons and spirits that Yorimitsu fought against.
Sources & Further Reading
For those wishing to dive deeper into the historical and mythological context of Minamoto no Yorimitsu and the Spider-Cutter, the following texts are essential:
- The Tale of the Heike (Heike Monogatari): A medieval epic that recounts the wars between the Taira and Minamoto clans, containing numerous references to the lineage of the swords.
- Otogizoshi: A collection of Muromachi-period short stories that details the fantastical adventures of Raikō and his retainers.
- Taiheiki: A historical epic that further elaborates on the genealogy of the famous Genji swords.