* Image is for illustrative purposes only.Emperor Go-Toba's Gobankaji System and Kikugyosaku — Imperial Sword Promotion in Late Insei Period
後鳥羽上皇の御番鍛冶と菊御作——院政末期の刀剣振興
In 1208 (Jogen 2), Retired Emperor Go-Toba established the Gobankaji system, summoning master smiths from across the country on a monthly rotation basis, and personally participated in forging, leaving behind 'Kikugyosaku' blades engraved with chrysanthemum crests on their tangs. This system dramatically elevated the technical standards of Japanese sword-making, bringing together twelve top smiths from Bizen, Bitchu, and Awataguchi in a national sword promotion undertaking.
Description
Historical Background
Retired Emperor Go-Toba (1180–1239) reigned as the 82nd Emperor from 1183 to 1198, continuing to hold political power through insei rule after his abdication. It is said that his deep consciousness about the loss of the sacred Kusanagi sword — which disappeared with the drowning of his half-brother Emperor Antoku at the Battle of Dan-no-ura, one of the three imperial regalia essential for succession — drew him toward sword devotion.
In 1208 (Jogen 2), at age 29, Retired Emperor Go-Toba established the "Gobankaji" system, summoning outstanding swordsmiths from across the country to Kyoto on a monthly rotation. This system was notable for Go-Toba's own extraordinary personal involvement — he personally swung the hammer as assistant smith and acquired sword-forging skills himself.
Structure of the Gobankaji System
The Gobankaji comprised twelve smiths (also called the Jogen Gobankaji), with one smith selected each month to assist the retired emperor's forging. While accounts vary, those chosen included the finest smiths of their time: Norisuke, Nobufusa, Muneyoshi, Sukemune, Yukikuni, and Sukenari from Bizen; Sadatsugu, Tsunetsugu, and Tsugiie from Bitchu; Kuniyasu and Kunitomo from Awataguchi; and Yukihira from Bungo Province.
Among these, Awataguchi Kuniyasu and Kunitomo were leading masters representing Kyoto's Awataguchi, while Yukihira, said to have served as the fourth-month smith, was the foremost practitioner of the Bungo tradition. The concentration of selected smiths from Bizen, Bitchu, and Awataguchi demonstrates that the cutting edge of Japanese sword technology in that era was concentrated in specific regions of the Kinai and western Japan rather than eastern Japan.
Characteristics of Kikugyosaku
Blades personally forged by the retired emperor through the Gobankaji bore engravings of 16- or 24-petal chrysanthemum crests on the tang (nakago). This is why they are called "Kikugyosaku" (chrysanthemum imperial work). The use of chrysanthemum crests as the imperial household emblem is said to have begun with this Go-Toba, making Kikugyosaku its precursor.
Surviving Kikugyosaku are extremely rare. The "Tachi: Kikugyosaku" held by the Kyoto National Museum is registered as a national treasure in e-Kokuho, with records also maintained in the Cultural Heritage Online database. The Kurokawa Institute of Ancient Cultures preserves an unsigned Kikugyosaku designated as an Important Cultural Property. These blades are also said to have been forged to inspire the morale of warriors at the time of the Jokyu Disturbance (1221).
Representative Smiths and Style
The smiths who participated in the Gobankaji added the high standards demanded by the retired emperor to their own traditional techniques, forming the golden age of swords from the early to middle Kamakura period. Awataguchi Kuniyasu and Kunitomo's elegant steel with nie-based tempering, and Bizen Norisuke's clean workmanship based on fine nie, represent the aesthetic of Gobankaji-era Japanese swords.
A tachi signed by Yukihira (Bungo-no-kuni Yukihira) is held by the Tokyo National Museum and recorded in e-Kokuho as a national treasure. Its clear steel and dignified form of the Bungo tradition is also evaluated as a product of technical exchange through Gobankaji participation.
Historical Significance
The Gobankaji system of Retired Emperor Go-Toba was the first and most renowned national initiative in which the imperial court systematically elevated the technical and cultural standards of Japanese swords. By temporarily concentrating swordsmithing techniques scattered across the country in Kyoto, the system generated technical exchange and mutual stimulation, promoting the dramatic development of Kamakura-period Japanese swords.
The system ended when Go-Toba was exiled to Oki following the Jokyu Disturbance, but the master smiths nurtured through the Gobankaji continued to be active across the country, laying the foundation for the golden age of Japanese swords. Even today, eight hundred years after the Jokyu Disturbance, the Oki Islands continue to carry on the sword culture associated with Go-Toba through the "New Gobankaji Project."
Characteristics of This Era
- Monthly rotation system gathering master smiths from across Japan in Kyoto
- Go-Toba's direct participation as assistant hammer-smith and chrysanthemum crest tang signature
- Technical exchange among Bizen, Bitchu, and Awataguchi smiths driving Kamakura-period advancement