The Little Known Lives of Koto Swordsmiths

[Mushin]

Smiths_Soldiers_Diplomats_Block_Sesko-FINAL.pSmiths_Soldiers_Diplomats_Block_Sesko-FINAL.pdf

Markus Sesko and I used to talk about how much we knew about Horikawa Kunihiro's life and travels compared to virtually every other smith before 1600. Then I came across Koyama Kanami's 1977 study of Akamatsu Masanori and his associates Katsumitsu and Munemitsu, I realized Kunihiro wasn't the only pre-Edo smith hiding in plain sight in the historical record. Markus and I began talking about a deep dive, and the result is the attached paper, which I hope stands out in a field where we know far more about the metallurgical features of great swordsmiths than about the men themselves. I am sharing it here with you guys first. It could not have been written without Markus's translations, discussions, and editorial judgment, which are evident on every page. I Hope you enjoy

 

Smiths_Soldiers_Diplomats_Block_Sesko-FINAL.pdf

[Brian]

That is a fantastic paper! Huge thanks for sharing. Is it ok if I upload to the downloads section?

[Mushin]

Please feel free Brian. The idea is to share. Thanks!!

 

[Mushin]

Here is the PDF version

Smiths_Soldiers_Diplomats_Block_Sesko-FINAL.pdf

[Brian]

Question....under the title, there are 5 blocks and then another 5 blocks. Should those be kanji?

[Mushin]

Just a design feature...

 

[Iwo87]

Wow! Thanks for sharing this amazing work with everyone. Incredibly generous. Can’t wait to take a deep dive into your passion project! Thanks again to you and Markus for all your hard work and willingness to share for the benefit of all of us.

[Lewis B]

Just finished reading. What a wonderful treatise about 2 unique swordsmith siblings working in a turbulent age and navigating a life, while still being able to follow their passion. Its a remarkable document, the two of you @Mushin and @Markus have created. Your piece is a moving tribute to their lives and work. 

 

One question. When the blades were signed gassaku, did one brother sign both signatures or did each sign his own name? I assume its possible to determine who was the author of the inscription based on their individual carving styles. 

[Jussi Ekholm]

This is a wonderful article. I learned so many new things from this. And now I have new appreciation for few swords I have seen, as this explains their background info.

[Mushin]

 

4 hours ago, Lewis B said:

Just finished reading. What a wonderful treatise about 2 unique swordsmith siblings working in a turbulent age and navigating a life, while still being able to follow their passion. Its a remarkable document, the two of you @Mushin and @Markus have created. Your piece is a moving tribute to their lives and work. 

 

One question. When the blades were signed gassaku, did one brother sign both signatures or did each sign his own name? I assume its possible to determine who was the author of the inscription based on their individual carving styles. 

From signatures, it looks like they took turns, and at other times made use of specialized assistants who signed for them. Remember they marched into Kyoto with a 60 assistants! They had a real studio. Not sure who they took with them when they were on the run but it's interesting. My gassaku, for instance, looks to have been inscribed by Munemitsu. Almost always Katsumtisu's name was first, But after Ukyo no Suke died and Munemitsu started working with his nephew Jirozaemon, Munemitsu's name was first. Seniority is what I assume.

[Bugyotsuji]

Just yesterday morning Jussi and I were admiring a joint Katsumitsu Munemitsu dedication blade at the Hōnōtō exhibition at the Okayama Prefectural Museum. Our guide was explaining some of this background.

 

Wishing I had read this excellent article beforehand! Dang…

 

Documentary movie one day?

[PNSSHOGUN]

Great read, it would be nice to have more examples of their works and scans of the original documents sprinkled throughout. 

[Takezo]

Fantastic read. Thanks for this 

[Mushin]

Thanks for all the kind words. I really enjoyed this project and I am glad you are as well. Thanks!

[Lewis B]

The brothers weren't the only smiths to inscribe their blades with important contextual documentation. Take this slightly later Gorozaemon Kiyomitsu, resident of Osafune Bizen Province. The nengo dates the swords production to a day in August (funny that) in 1554. Reading further and the inscription states it was commissioned by Tokuoka Kageyuzaemon-no-jo Ieyasu and completed in the castle town of Tatsuno in Harima Province. 

 

https://hyozaemon.jp/product/goroukiyomitu/

Edited June 19 by Lewis B

[Rivkin]

Really enjoyed reading it!

[Hoshi]

Wonderful article, thank you sharing. 

[Mushin]

17 hours ago, Lewis B said:

The brothers weren't the only smiths to inscribe their blades with important contextual documentation. 

 

https://hyozaemon.jp/product/goroukiyomitu/

Thank you again for all the great feedback. And absolutely, Lewis, the practice was not uncommon heading into the Muromachi to inscribe more information on nakago, including patrons, places and even prayers. Here's an example of the later (again by Ukyo no Suke Katsumitsu) on the mune of a tanto: https://sanmei.com/contents/media/T2174_T5010_PUP_E.html

Also interesting is the practice of gassaku with other Bizen smiths outside their immediate circle seemed to be a thing for a while around the late Meio and Eisho eras. There is one on the market now between Tadamitsu and Muneumitsu: https://sanmei.com/contents/media/T2174_T5010_PUP_E.html. But there are even earlier ones with Norimitsu. Then of course, there is the famous Tokubestu Juyo nagainata jointly made by Jirozaemon no Jo Katsumitsu and the Shodai Yosozaemon Sukesada below. Interesting work in Bizen between Bunmei and Daei in particular but it carried forward by others like Kiyomitsu as you pointed out. 

[Rivkin]

Don't know enough about the signature (Kosho would make it one of the earliest known?? more likely the previous generation), but the work is strong, despite a rather dated polish.

Edited June 20 by Rivkin

[Mushin]

Kosho (1455-57)! That would mean that Munemitsu, if born in 1436/37, was somewhere between 18 to 21 when this was made. It's not impossible, but more likely this is by the 4th generation whose working period is listed as 1444-1449. Markus' A-Z of Japanese Sword smiths says the earliest known signature for Sakyo no Shin is 1469, but we are constantly seeing pieces coming out of the woodwork that are upending those dates. The work looks nice as and you can see the transition moving to Sue Bizen. I like it! What are the dimensions of the blade?

 

[Rivkin]

18 hours ago, Mushin said:

Kosho (1455-57)! That would mean that Munemitsu, if born in 1436/37, was somewhere between 18 to 21 when this was made. It's not impossible, but more likely this is by the 4th generation whose working period is listed as 1444-1449. Markus' A-Z of Japanese Sword smiths says the earliest known signature for Sakyo no Shin is 1469, but we are constantly seeing pieces coming out of the woodwork that are upending those dates. The work looks nice as and you can see the transition moving to Sue Bizen. I like it! What are the dimensions of the blade?

 

 

Its a wakizashi, I guess 18 inches.

[Jussi Ekholm]

About the gassaku signatures for Muromachi Bizen, if I understood the explanation correctly (high chance I have gotten something wrong 😅) and I got overflow of information in one day.

 

I would use word "prestige" here. As in smith with more prestige would usually be the first in signature. And seniority often carries prestige.

 

At Osafune Sword Museum there was a gassaku wakizashi made in 1560 by Katsumitsu & Kiyomitsu, that had lot of background. Now there was so much info coming in I might have gotten something wrong. Katsumitsu was seen having more prestige than Kiyomitsu. However he angered higher powers and had to flee Osafune for some time. After his return Kiyomitsu was now seen above him in prestige, so in this wakizashi Kiyomitsu name is before Katsumitsu. Even though Katsumitsu was supposedly the better smith. Hopefully I got that correct. 😅😅

[Mushin]

On 6/22/2026 at 7:49 AM, Jussi Ekholm said:

At Osafune Sword Museum there was a gassaku wakizashi made in 1560 by Katsumitsu & Kiyomitsu, that had lot of background. Now there was so much info coming in I might have gotten something wrong. Katsumitsu was seen having more prestige than Kiyomitsu. However he angered higher powers and had to flee Osafune for some time. After his return Kiyomitsu was now seen above him in prestige, so in this wakizashi Kiyomitsu name is before Katsumitsu. Even though Katsumitsu was supposedly the better smith. Hopefully I got that correct. 😅😅

Jussi, while I don't know the story about Katsumitsu fleeing the village, what is clear is that by 1560, the situation in Osafune had changed considerably. The glory days of the Katsumitsu line were already in the past. The atelier appears to have been much smaller than it had been during the time of Ukyo no Suke Katsumitsu and Sakyo no Shin Munemitsu, and it was operating alongside a number of related Osafune branches, particularly the descendants of Jirobei Harumitsu, the second son of Jirozaemon no Jō Katsumitsu. The Harumitsu branch seems to have specialized in higher-quality and often more individual commissions, producing many tantō and the occasional longer uchigatana.

Also, by the Eiroku era, the economics of sword production had shifted dramatically. Demand generated by the Sengoku wars encouraged the large-scale manufacture of kazuuchimono, and the principal beneficiaries of that market were the Kiyomitsu and Sukesada groups. These two houses grew into the dominant producers in Osafune, overshadowing many of the older family lines in both size and output.

At the same time, Bizen's political landscape was also changing. Since the death of Akamatsu Masanori, the province had been dominated by the Uragami clan, who were also big patrons of the Katsumitsu. But by the mid-sixteenth century the Uragami were weakened by internal divisions and increasingly dependent upon their powerful retainer, Ukita Naoie. During the 1560s, Naoie expanded his influence while maintaining a nominal loyalty to his lords, eventually emerging as the effective ruler of Bizen. Such political and economic upheavals almost certainly affected the fortunes of the Katsumitsu line, as they did many other Osafune families.

Against that backdrop, the placement of Kiyomitsu's name before Katsumitsu's becomes easier to understand. Whether the order reflects seniority, prestige, commercial influence, or simply the circumstances of the commission cannot be known with certainty. However, by the Eiroku period the Kiyomitsu workshops were among the most prominent and productive in Osafune, while the Katsumitsu line no longer occupied the commanding position it had enjoyed a century earlier.

On the issue of Katsumits fleeing the village, I have not seen and can't find anything to support this, but I guess it's possible. The documentary record for many late-Bizen smiths is fragmentary and not all of it is available online.

What is striking,though, is that when the Yoshii River flood of 1590 devastated Osafune and effectively brought the great Bizen tradition to an end, the powerful Kiyomitsu line disappeared from history. Among the few branches that survived were members of the Sukesada line and descendants of the Harumitsu branch. In that sense, although the Katsumitsu family had long since lost its former prominence, its bloodline appears to have been among the last remnants of the classical Osafune tradition.

[Jussi Ekholm]

Thank you for the wonderful historical info package Bobby. There was so much going on in the area during Muromachi period.

 

I think it is possible that I could very well mixing up ruler patronage shifts from one lineage to another etc. 

 

There was so much going on in the area historically. It was great riding with Piers as he explained the geographical shifts in the area while we drove past certain areas. Would be awesome some day spend a long time just walking around the various historical areas of Bizen swordsmithing.

[Markus]

@Jussi Ekholm That walking around part, I did that once and got lost, lol. Walked too far... That was before the smartphone era. A retired local taxi driver "rescued" me and when he asked me what I was doing and I explained I am a sword nerd, he drove me around to show me all the historic sword making sites. He had to quickly stop by his house to tell his wife he will be late for dinner that day, haha. Fond memories.