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The Kogarasu Maru: Unlocking The Mysteries Of Japan's Ancient Blade

The Kogarasu Maru, also known as the "Little Crow," is a legendary Japanese sword with a unique double-edged design. This ancient blade holds a special place in Japan's history and culture, as it is believed to have been wielded by Emperor Keiko and his son, Prince Yamato Takeru. In this blog post, we will delve into the mysteries surrounding the Kogarasu Maru, exploring its origins, craftsmanship, and influence on Japanese art and literature.


Origins and History of the Kogarasu Maru

The exact origins of the Kogarasu Maru remain shrouded in mystery, but it is widely believed to date back to the late 7th or early 8th century. Some legends suggest that the sword was forged by the renowned swordsmith Amakuni, while others attribute its creation to divine intervention. Regardless of its origins, the Kogarasu Maru is considered one of the oldest and most significant swords in Japanese history.

The Sword's Connection to Emperor Keiko and Prince Yamato Takeru

The Kogarasu Maru is closely associated with Emperor Keiko, the 12th Emperor of Japan, and his son, Prince Yamato Takeru. According to legend, the emperor bestowed the sword upon his son as a symbol of his divine right to rule. Prince Yamato Takeru went on to use the Kogarasu Maru in many battles, and it is said that the sword's unique design saved his life on multiple occasions.

Significance of the Sword's Unique Double-edged Design

Unlike traditional Japanese swords, which typically have a single-edged blade, the Kogarasu Maru features a distinctive double-edged design. This rare feature is believed to symbolize the duality of life and death, as well as the balance between the divine and human realms. The sword's design has also been interpreted as a reflection of the dual nature of Prince Yamato Takeru, who was known for his cunning and martial prowess.


Craftsmanship and Features

The Forging Process and Materials Used

The Kogarasu Maru was forged using traditional Japanese sword-making techniques, which involve folding and hammering high-quality steel multiple times to create a strong, flexible blade. Although the exact materials and methods used to create the Kogarasu Maru are unknown, it is likely that the sword was crafted from tamahagane, a type of steel produced from iron sand. The blade would have been polished and sharpened to create its distinctive double-edged design.


Distinctive Characteristics of the Kogarasu Maru

In addition to its double-edged blade, the Kogarasu Maru features several other unique characteristics. The sword's blade has a gentle curve, which is more pronounced than that of a typical Japanese sword. The hilt is wrapped in a traditional tsuka-ito, or handle wrapping, made from silk or leather. The sword's tsuba, or handguard, is adorned with intricate carvings that depict scenes from Japanese mythology.


Comparison with Other Japanese Swords, Such as the Katana

While the Kogarasu Maru shares some similarities with other Japanese swords, such as the katana, its unique features set it apart from its counterparts. The most obvious difference is the sword's double-edged design, which is rarely seen in traditional Japanese weaponry. Additionally, the Kogarasu Maru's gentle curve and ornate decorations further distinguish it from other swords, making it a truly unique and remarkable piece of craftsmanship.


The Kogarasu Maru in Art and Literature

  1. The Kogarasu Maru has been a popular subject in Japanese art throughout history. Traditional paintings, woodblock prints, and sculptures often depict scenes featuring the sword, highlighting its legendary status and significance. These artistic representations not only showcase the sword's unique design but also serve to preserve and perpetuate the myths and stories associated with the Kogarasu Maru.
  2. The Kogarasu Maru has also made its mark on Japanese literature, poetry, and folklore. Many classical texts, such as the Kojiki and the Nihon Shoki, mention the sword and its connection to Emperor Keiko and Prince Yamato Takeru. Additionally, the Kogarasu Maru has inspired countless poems, songs, and stories that celebrate the sword's legendary status and the adventures of its famous wielders.
  3. The Kogarasu Maru's enduring legacy has extended into modern Japanese popular culture as well. The sword has appeared in numerous manga, anime, and video games, often as a powerful and coveted weapon. By featuring the Kogarasu Maru in contemporary media, creators pay homage to the sword's historical and cultural significance while introducing it to new generations of fans.


The Current Status of the Kogarasu Maru

Ownership and Preservation of the Sword

The Kogarasu Maru is currently in the possession of the Japanese Imperial Family, who have taken great care to preserve the sword and its rich history. While the sword is rarely displayed in public, it has been occasionally exhibited at museums and special events, allowing the public to catch a glimpse of this legendary blade.


Display and Exhibition of the Kogarasu Maru

As mentioned earlier, the Kogarasu Maru is not frequently exhibited to the public. However, when it is displayed, the sword is usually accompanied by detailed information about its history, craftsmanship, and significance in Japanese culture. These exhibitions provide a rare opportunity for visitors to appreciate the beauty and power of the Kogarasu Maru up close.


Efforts to Authenticate and Study the Sword

Ongoing research and analysis have been conducted to authenticate and learn more about the Kogarasu Maru. Experts in metallurgy, sword-making, and Japanese history have studied the sword, using modern technology to uncover its secrets. While some questions about the Kogarasu Maru's origins and history remain unanswered, these efforts have helped to deepen our understanding of the sword and its place in Japanese culture.



The Kogarasu Maru is an iconic symbol of Japan's rich history and cultural heritage. By exploring its origins, craftsmanship, and influence on art and literature, we have gained a deeper appreciation for this unique and legendary blade. The mysteries surrounding the Kogarasu Maru continue to captivate the imagination, and we invite you to join us in further unraveling the enigma of this ancient and revered sword.