Mondo-no-Sho Masakiyo is said to have been born in Kanbun 10 (1670) at Izumi-go in Satsuma, common name Miyahara Seiemon, also called Kakudayu. He learned forging from the Satsuma domain smith Maruta Sozaemon Masafusa, first signing Kiyomitsu and later changing the name to Masakiyo. In the first month of Kyoho 6 (1721) he was summoned together with his townsman Ippei Yasuyo by the eighth shogun Tokugawa Yoshimune to forge in Edo, and his skill was such that the bakufu granted him the right to cut the single-leaf hollyhock crest of the Tokugawa on his tang. On his return journey the Imperial Court raised him to the title Mondo-no-Sho. He died in Kyoho 15 (1730) at sixty-one. The published sources frame him by a single pairing they return to whenever they place him: with Yasuyo he is, in their words, one of "the twin pillars of Satsuma shinto" (「安代と並んで薩摩新刀の双璧」)[[c:1]], and where Yasuyo often tempered a calm notare-toned suguha, Masakiyo tempered the varied, vigorous midare that became the recognized hand of the school.

His characteristic work is the Soshu-den the published sources say he handled with greatest mastery, modelled on the old Shizu manner. Over a strongly forged itame he tempers a ko-notare into which he sets gunome, ko-gunome and pointed togariba, the temper deep in nioi and the nie thick and strong with coarse ara-nie mixed in. Through the ha run long, frequent kinsuji and nie-suji with sunagashi, the streaming nie-lines of a Satsuma hand, and ashi and yo enter well. The pointed teeth set into the undulating notare are the spine of his recognition, the feature that separates his varied midareba from the level suguha of his fellow pillar. The sources name the manner plainly as "the Shizu-style working range that he most excelled in" (「最も得意とした志津風の作域」)[[c:2]], and on his finest blades they say the result comes near old superior work.

The jigane beneath is the constant. It is a well-forged itame that overall flows strongly and turns masame-inclined, at times a tighter ko-itame mixed with mokume, carrying thick ji-nie with coarse ji-nie mixed and vigorous chikei the sources liken to a distinctive metallic figuring. The steel is masame-prone precisely because the Shizu model asks for it, and the long kinsuji ride that flowing grain into the boshi, which runs in midare-komi or notare to a pointed return, swept with hakikake and turning back deeply. The nioiguchi is bright and clear and only here and there a little uneven. His body is the grand Satsuma form, extremely wide in mihaba with thick kasane and ample hiraniku, an extended chu-kissaki and a sense of funbari, and the published commentary calls such a blade bold, heroic and robust, with the feeling of a decisive downward cut.

There is a second feature the judges single out as a recognition point and read as antique. Especially in the upper half, at the crests of the temper, vigorous yubashiri gather and present an appearance like nijuba, the double temper-line of old work, while long kinsuji and nie-suji run through and sunagashi accompanies them. The sources name it directly, writing that "the manner in which yubashiri are vigorously applied at the crests of the temper to produce a nijuba-like appearance conveys an impression of antique flavor" (「焼頭に湯走り風がさかんにかかって二重刃状を呈している様には, 古色の風が感ぜられる」)[[c:3]]. This is not a separate manner but the upper reach of his characteristic hand, the nie-activity pushed to its fullest over the same flowing itame. His tang carries its own constant: almost always ubu, tapering to an iriyama-gata or sword-shaped tip with shallow katte-sagari file marks, the large long signature cut boldly, and on the blades made before the shogun a single-leaf hollyhock crest with a date. The published sources also caution the collector that in his later years many surviving blades were made as daimei by his son Masachika and his pupil Masamori, so a late Masakiyo signature is read against that workshop.

What sets him within his province is exactly the pairing the judges name and the manner they keep returning to. He is read first against his elder townsman Yasuyo, the two held together as the twin pillars of Satsuma shinto, and the distinction is precise: Yasuyo is the calm notare-toned suguha, Masakiyo the varied Shizu-style midare with its pointed togariba, its coarse nie and its long running kinsuji. His own bright deep-nioi gunome, his gathering yubashiri and the nijuba of antique flavor are the grounded traits that mark him out, not a borrowed comparison, and the published sources go so far as to say his best work can be mistaken "for old superior blades" (「往々古刀上位の作に見まがう」)[[c:4]]. He stands at the head of the Ichinohira-allied Satsuma shinto masters, the hand by which a varied Soshu-style Satsuma blade of his generation is read.

For the collector he is one of the great names of Satsuma shinto, and his work survives almost wholly ubu and signed. He has no National Treasures and no Important Cultural Properties; his record on the modern designation tiers runs through the Tokubetsu Juyo and Juyo ranks, where twenty-three of his works are held, several dated and many carrying the hollyhock crest granted before the shogun. His provenance reaches the highest houses of his age: his masterpiece katana and wakizashi, presented together with a blade by Yasuyo by the Satsuma lord Shimazu Tsuguhisa to Konoe Iehisa, Minister of the Left, who treasured them so that he sent both smiths gifts of fine silver and a set of poems of the Six Immortal Poets endorsed by court nobles, the documents still surviving; and pieces preserved with the provenance of the Tokugawa shogunal house and the Imperial family. Most designated blades, including those in private hands, are held rather than traded, and a fine signed Masakiyo of his Shizu-style Soshu-den comes to market only from time to time and with patience. His work is, comparatively, among the more findable of the first-rank shinto masters, more so than the locked heritage of the old traditions, but a dated, crest-bearing katana in his full vigorous manner remains a landmark acquisition, a document of how the Satsuma school reached its early summit.

Mondo-no-Sho Masakiyo is said to have been born in Kanbun 10 (1670) at Izumi-go in Satsuma, common name Miyahara Seiemon, also called Kakudayu. He learned forging from the Satsuma domain smith Maruta Sozaemon Masafusa, first signing Kiyomitsu and later changing the name to Masakiyo. In the first month of Kyoho 6 (1721) he was summoned together with his townsman Ippei Yasuyo by the eighth shogun Tokugawa Yoshimune to forge in Edo, and his skill was such that the bakufu granted him the right to cut the single-leaf hollyhock crest of the Tokugawa on his tang. On his return journey the Imperial Court raised him to the title Mondo-no-Sho. He died in Kyoho 15 (1730) at sixty-one. The published sources frame him by a single pairing they return to whenever they place him: with Yasuyo he is, in their words, one of "the twin pillars of Satsuma shinto" (「安代と並んで薩摩新刀の双璧」)[[c:1]], and where Yasuyo often tempered a calm notare-toned suguha, Masakiyo tempered the varied, vigorous midare that became the recognized hand of the school.

His characteristic work is the Soshu-den the published sources say he handled with greatest mastery, modelled on the old Shizu manner. Over a strongly forged itame he tempers a ko-notare into which he sets gunome, ko-gunome and pointed togariba, the temper deep in nioi and the nie thick and strong with coarse ara-nie mixed in. Through the ha run long, frequent kinsuji and nie-suji with sunagashi, the streaming nie-lines of a Satsuma hand, and ashi and yo enter well. The pointed teeth set into the undulating notare are the spine of his recognition, the feature that separates his varied midareba from the level suguha of his fellow pillar. The sources name the manner plainly as "the Shizu-style working range that he most excelled in" (「最も得意とした志津風の作域」)[[c:2]], and on his finest blades they say the result comes near old superior work.

The jigane beneath is the constant. It is a well-forged itame that overall flows strongly and turns masame-inclined, at times a tighter ko-itame mixed with mokume, carrying thick ji-nie with coarse ji-nie mixed and vigorous chikei the sources liken to a distinctive metallic figuring. The steel is masame-prone precisely because the Shizu model asks for it, and the long kinsuji ride that flowing grain into the boshi, which runs in midare-komi or notare to a pointed return, swept with hakikake and turning back deeply. The nioiguchi is bright and clear and only here and there a little uneven. His body is the grand Satsuma form, extremely wide in mihaba with thick kasane and ample hiraniku, an extended chu-kissaki and a sense of funbari, and the published commentary calls such a blade bold, heroic and robust, with the feeling of a decisive downward cut.

There is a second feature the judges single out as a recognition point and read as antique. Especially in the upper half, at the crests of the temper, vigorous yubashiri gather and present an appearance like nijuba, the double temper-line of old work, while long kinsuji and nie-suji run through and sunagashi accompanies them. The sources name it directly, writing that "the manner in which yubashiri are vigorously applied at the crests of the temper to produce a nijuba-like appearance conveys an impression of antique flavor" (「焼頭に湯走り風がさかんにかかって二重刃状を呈している様には, 古色の風が感ぜられる」)[[c:3]]. This is not a separate manner but the upper reach of his characteristic hand, the nie-activity pushed to its fullest over the same flowing itame. His tang carries its own constant: almost always ubu, tapering to an iriyama-gata or sword-shaped tip with shallow katte-sagari file marks, the large long signature cut boldly, and on the blades made before the shogun a single-leaf hollyhock crest with a date. The published sources also caution the collector that in his later years many surviving blades were made as daimei by his son Masachika and his pupil Masamori, so a late Masakiyo signature is read against that workshop.

What sets him within his province is exactly the pairing the judges name and the manner they keep returning to. He is read first against his elder townsman Yasuyo, the two held together as the twin pillars of Satsuma shinto, and the distinction is precise: Yasuyo is the calm notare-toned suguha, Masakiyo the varied Shizu-style midare with its pointed togariba, its coarse nie and its long running kinsuji. His own bright deep-nioi gunome, his gathering yubashiri and the nijuba of antique flavor are the grounded traits that mark him out, not a borrowed comparison, and the published sources go so far as to say his best work can be mistaken "for old superior blades" (「往々古刀上位の作に見まがう」)[[c:4]]. He stands at the head of the Ichinohira-allied Satsuma shinto masters, the hand by which a varied Soshu-style Satsuma blade of his generation is read.

For the collector he is one of the great names of Satsuma shinto, and his work survives almost wholly ubu and signed. He has no National Treasures and no Important Cultural Properties; his record on the modern designation tiers runs through the Tokubetsu Juyo and Juyo ranks, where twenty-three of his works are held, several dated and many carrying the hollyhock crest granted before the shogun. His provenance reaches the highest houses of his age: his masterpiece katana and wakizashi, presented together with a blade by Yasuyo by the Satsuma lord Shimazu Tsuguhisa to Konoe Iehisa, Minister of the Left, who treasured them so that he sent both smiths gifts of fine silver and a set of poems of the Six Immortal Poets endorsed by court nobles, the documents still surviving; and pieces preserved with the provenance of the Tokugawa shogunal house and the Imperial family. Most designated blades, including those in private hands, are held rather than traded, and a fine signed Masakiyo of his Shizu-style Soshu-den comes to market only from time to time and with patience. His work is, comparatively, among the more findable of the first-rank shinto masters, more so than the locked heritage of the old traditions, but a dated, crest-bearing katana in his full vigorous manner remains a landmark acquisition, a document of how the Satsuma school reached its early summit.