The first-generation Tadayoshi of Hizen, the published sources record, styled himself Hashimoto Shinzaemon and served as a retained smith of the Nabeshima of Hizen. By domain order in Keicho 1 (1596) he went up to Kyoto together with the carver Munenaga and entered the school of Umetada Myoju, where he studied sword forging while Munenaga learned carving; they returned to their province in Keicho 3 (1598), and Tadayoshi settled in the castle town below Saga, where under the domain's patronage the line flourished greatly. His dated work begins from the eighth month of Keicho 5 (1600) and runs to the eighth month of Kan'ei 9 (1632), the year he died, a working career the published sources reckon at thirty-two years. In Genna 10 (1624) he went up to Kyoto a second time, received the court title Musashi Daijo, and changed his name from Tadayoshi to Tadahiro, altering his clan name from Minamoto to Fujiwara. He is the founder of Hizen-to, and the school he raised under Nabeshima patronage came to dominate the sword-making of Kyushu.

His mainstay is a bright, tight suguha tempered upon the fine jigane that is the signature of Hizen work. The published sources describe it plainly: "his favored suguha is tempered upon a well-knit ko-itame, the distinctive jigane commonly called kome-nuka-hada, and in it he aimed at the manner of the Rai school"[[c:1]]. The temper is a chu-suguha or hiro-suguha carrying only a shallow notare, at times mixed with ko-gunome, into which ko-ashi and yo enter; the nioiguchi is deep with finely clustered ko-nie, and it tightens to a bright clarity. Yet, the same sources note, the work departs from the Rai originals it looks to: the nioiguchi is tighter and brighter, fine chikei enter the ji abundantly, and the forging "has rather more vigor than the Rai pieces"[[c:2]]. The temper and the steel together carry the recognition.

That steel is the heart of the matter. The forging is a dense, well-knit ko-itame, at times with mokume mixed in, over which ji-nie gathers as the finest particles and lies thickly; fine chikei enter intricately and the steel is notably clear. The published sources give it its name as a feature peculiar to his hand, the surface taking on the "distinctive kome-nuka-hada"[[c:3]], the fine, bright, rice-bran texture that no other school produces. Upon it the boshi runs straight and turns back in a quiet ko-maru, the regular finish of a Hizen point. This combination, the clear konuka-hada beneath a tight bright suguha, is what the published record returns to again and again as the founder's proper manner, the work that places his suguha at the head of the tradition.

His early years are another matter, and the published sources read them as a period of copies. The constant formula is repeated almost verbatim from blade to blade: "his early manner comprises a wide range, full of utsushi-mono"[[c:4]], naming Naoe-Shizu, old Yamato work, and the Rai and Kamakura masters. In the Naoe-Shizu vein he forges a ko-notare mixed with ko-gunome, ko-ashi entering and sunagashi running, the nioiguchi slightly tightened, a manner the sources say inherits the ko-notare that was Myoju's particular forte and is "commonly called Naoe-Shizu utsushi"[[c:5]]. In the old-Yamato vein the itame grows larger and flows toward the edge, kuichigaiba and nijuba mix in with hotsure and frequent sunagashi, and even the boshi finishes with a touch of hakikake; of one such piece the sources say it shows "the most archaic manner among Tadayoshi's works, with deep, lingering appeal"[[c:6]], the hakikake boshi standing as the exception to the rule that the Hizen point turns back in a quiet ko-maru. He admired the Kamakura tanto masters as well, above all Rai Kunimitsu, and copied the Bizen Kagemitsu on occasion, one katakiriba tanto being an utsushi of a Kagemitsu transmitted in the Nabeshima house.

The through-line of his career is the signature itself, which the published sources divide into three forms by period. He cut "Hizen no Kuni Tadayoshi" in five characters, the so-called five-character Tadayoshi mei; he signed in eight characters as "Hizen no Kuni junin Tadayoshi saku," the junin mei; and after the Musashi Daijo title of Genna 10 (1624) he used the "Musashi Daijo Tadahiro" signature, the rename being a single hand's chronology and not a change of person. The presentation pieces signed "Hizen no Kuni ju Fujiwara Tadahiro" without the title are the kenjo-mei, ordered by the Nabeshima, who held the title-signature unnecessary on a blade made for the house. The kiriba-zukuri pieces common in his Tadayoshi years, the sources note, become rare under the Tadahiro name. The mei is cut on the ura, the practice of Tadayoshi and his line; almost all of his recorded work is signed, 125 of 129 records carrying his hand, so the signature is itself part of the appraisal, though the five-character form, imitated by the later Tosa-no-kami and the third-generation Mutsu-no-kami, dates a piece only together with the rest of the workmanship.

From him descends the whole Hizen school. His son the second-generation Omi Daijo Tadahiro carried on the konuka-hada and the suguha to become the most prolific of the Hizen smiths, and the line continued through the third-generation Mutsu-no-kami Tadayoshi and the Tosa-no-kami branch, the published sources noting that the third generation in particular returned in style toward his grandfather the founder, especially accomplished in suguha and skilled also at choji-midare. Tadayoshi is Sai-jo saku in Fujishiro's grading. The weight of designation behind his name runs to one Important Cultural Property, ten Tokubetsu Juyo and a large body of Juyo, one hundred and eighteen blades in the Tokubetsu Juyo and Juyo tiers, with a single prewar Juyo Bijutsuhin piece and no National Treasures; one hundred and twenty-seven of his works survive with an official record. His blades carry a Nabeshima provenance and pass through notable hands, the recorded transmissions naming the Owari Tokugawa Family, the Satake Family and the Imperial Family among others, with a kinzogan cutting-test inscription on one and a Myoju soemei on another that documents his discipleship. The bulk of what survives is held in long-standing collections and institutions such as the Takamatsu Historical Museum, and most are kept rather than traded; one comes to open hands only from time to time, and as the founder's own work it is a landmark of the Hizen tradition when it does.

The first-generation Tadayoshi of Hizen, the published sources record, styled himself Hashimoto Shinzaemon and served as a retained smith of the Nabeshima of Hizen. By domain order in Keicho 1 (1596) he went up to Kyoto together with the carver Munenaga and entered the school of Umetada Myoju, where he studied sword forging while Munenaga learned carving; they returned to their province in Keicho 3 (1598), and Tadayoshi settled in the castle town below Saga, where under the domain's patronage the line flourished greatly. His dated work begins from the eighth month of Keicho 5 (1600) and runs to the eighth month of Kan'ei 9 (1632), the year he died, a working career the published sources reckon at thirty-two years. In Genna 10 (1624) he went up to Kyoto a second time, received the court title Musashi Daijo, and changed his name from Tadayoshi to Tadahiro, altering his clan name from Minamoto to Fujiwara. He is the founder of Hizen-to, and the school he raised under Nabeshima patronage came to dominate the sword-making of Kyushu.

His mainstay is a bright, tight suguha tempered upon the fine jigane that is the signature of Hizen work. The published sources describe it plainly: "his favored suguha is tempered upon a well-knit ko-itame, the distinctive jigane commonly called kome-nuka-hada, and in it he aimed at the manner of the Rai school"[[c:1]]. The temper is a chu-suguha or hiro-suguha carrying only a shallow notare, at times mixed with ko-gunome, into which ko-ashi and yo enter; the nioiguchi is deep with finely clustered ko-nie, and it tightens to a bright clarity. Yet, the same sources note, the work departs from the Rai originals it looks to: the nioiguchi is tighter and brighter, fine chikei enter the ji abundantly, and the forging "has rather more vigor than the Rai pieces"[[c:2]]. The temper and the steel together carry the recognition.

That steel is the heart of the matter. The forging is a dense, well-knit ko-itame, at times with mokume mixed in, over which ji-nie gathers as the finest particles and lies thickly; fine chikei enter intricately and the steel is notably clear. The published sources give it its name as a feature peculiar to his hand, the surface taking on the "distinctive kome-nuka-hada"[[c:3]], the fine, bright, rice-bran texture that no other school produces. Upon it the boshi runs straight and turns back in a quiet ko-maru, the regular finish of a Hizen point. This combination, the clear konuka-hada beneath a tight bright suguha, is what the published record returns to again and again as the founder's proper manner, the work that places his suguha at the head of the tradition.

His early years are another matter, and the published sources read them as a period of copies. The constant formula is repeated almost verbatim from blade to blade: "his early manner comprises a wide range, full of utsushi-mono"[[c:4]], naming Naoe-Shizu, old Yamato work, and the Rai and Kamakura masters. In the Naoe-Shizu vein he forges a ko-notare mixed with ko-gunome, ko-ashi entering and sunagashi running, the nioiguchi slightly tightened, a manner the sources say inherits the ko-notare that was Myoju's particular forte and is "commonly called Naoe-Shizu utsushi"[[c:5]]. In the old-Yamato vein the itame grows larger and flows toward the edge, kuichigaiba and nijuba mix in with hotsure and frequent sunagashi, and even the boshi finishes with a touch of hakikake; of one such piece the sources say it shows "the most archaic manner among Tadayoshi's works, with deep, lingering appeal"[[c:6]], the hakikake boshi standing as the exception to the rule that the Hizen point turns back in a quiet ko-maru. He admired the Kamakura tanto masters as well, above all Rai Kunimitsu, and copied the Bizen Kagemitsu on occasion, one katakiriba tanto being an utsushi of a Kagemitsu transmitted in the Nabeshima house.

The through-line of his career is the signature itself, which the published sources divide into three forms by period. He cut "Hizen no Kuni Tadayoshi" in five characters, the so-called five-character Tadayoshi mei; he signed in eight characters as "Hizen no Kuni junin Tadayoshi saku," the junin mei; and after the Musashi Daijo title of Genna 10 (1624) he used the "Musashi Daijo Tadahiro" signature, the rename being a single hand's chronology and not a change of person. The presentation pieces signed "Hizen no Kuni ju Fujiwara Tadahiro" without the title are the kenjo-mei, ordered by the Nabeshima, who held the title-signature unnecessary on a blade made for the house. The kiriba-zukuri pieces common in his Tadayoshi years, the sources note, become rare under the Tadahiro name. The mei is cut on the ura, the practice of Tadayoshi and his line; almost all of his recorded work is signed, 125 of 129 records carrying his hand, so the signature is itself part of the appraisal, though the five-character form, imitated by the later Tosa-no-kami and the third-generation Mutsu-no-kami, dates a piece only together with the rest of the workmanship.

From him descends the whole Hizen school. His son the second-generation Omi Daijo Tadahiro carried on the konuka-hada and the suguha to become the most prolific of the Hizen smiths, and the line continued through the third-generation Mutsu-no-kami Tadayoshi and the Tosa-no-kami branch, the published sources noting that the third generation in particular returned in style toward his grandfather the founder, especially accomplished in suguha and skilled also at choji-midare. Tadayoshi is Sai-jo saku in Fujishiro's grading. The weight of designation behind his name runs to one Important Cultural Property, ten Tokubetsu Juyo and a large body of Juyo, one hundred and eighteen blades in the Tokubetsu Juyo and Juyo tiers, with a single prewar Juyo Bijutsuhin piece and no National Treasures; one hundred and twenty-seven of his works survive with an official record. His blades carry a Nabeshima provenance and pass through notable hands, the recorded transmissions naming the Owari Tokugawa Family, the Satake Family and the Imperial Family among others, with a kinzogan cutting-test inscription on one and a Myoju soemei on another that documents his discipleship. The bulk of what survives is held in long-standing collections and institutions such as the Takamatsu Historical Museum, and most are kept rather than traded; one comes to open hands only from time to time, and as the founder's own work it is a landmark of the Hizen tradition when it does.