The published sources count Yoshihira (吉平) among the smiths who represent the Fukuoka Ichimonji school of Bizen at its height in the mid-Kamakura period, and most genealogies record him as a grandson of Muneyoshi (宗吉) and a son of Yoshiie (吉家), which places him in the same brilliant generation as Yoshifusa, Sukezane and Norifusa. The swordsmith registers date his activity to around the Kangen era (1243 to 1247), while one designation text gives around Bun'o (1260). His standing within that company was fixed by Honma's judgment, preserved in the record of one of his Juyo Bijutsuhin tachi: among mid-Kamakura Bizen work, "the most flamboyant choji are tempered by Yoshifusa and this Yoshihira"[[c:1]]. Several signed tachi survive, and the same sources note that one of them holds the rank of Kokuho.

For his characteristic hand the published sources repeat a single formula: beside Yoshifusa or Sukezane his work shows less of the grand o-choji-midare, yet it abounds in change, and "one often sees examples in which the interior of the ha becomes laden with nie"[[c:2]]. That variation has a precise vocabulary. Into his choji-midare enter kawazuko-choji and fukuro-choji, gunome and occasional slightly pointed forms mix in, and the yakiba rises and falls conspicuously. Ashi and yo enter well, the nioi runs deep with fine ko-nie, and kinsuji and sunagashi work through the ha. His grandest pieces are described as "a style rich in variation, mixing fukuro, juka and kawazuko choji"[[c:3]], and on the Tokubetsu Juyo tachi of the twenty-first session the temper even turns saka-gakari over the lower half, a feature of which the NBTHK writes that there are "no comparable examples among Yoshihira's works"[[c:4]].

The jigane is an itame, in places mixed with mokume and flowing hada, and its inclination to stand is stated outright: compared with his contemporaries of the school, the published record observes, "the jigane also tends somewhat to stand"[[c:5]]. Ji-nie adheres, on the finest blades thickly and with chikei entering, and a midare-utsuri rises distinctly on nearly every recorded work. The boshi runs midare-komi and returns in ko-maru, at times taking a pointed tendency with hakikake; on some blades it is sugu with a yakitsume feeling.

Within this one manner the judges distinguish two registers. The quiet, small-patterned pieces lean from ko-choji toward suguha, with a tighter nioiguchi and an unusually even yakihaba; of one such Juyo Bijutsuhin tachi from the Hachisuka family, Honma remarks that it is "unusual for this smith in that the yakiba shows little difference in height, yet it is genuine"[[c:6]]. The grand register stands at the opposite pole, "as bustling as Yoshifusa"[[c:7]], and the mumei katana of the first Tokubetsu Juyo session was judged "even more flamboyant than the signed works"[[c:8]]. His mei is normally the two characters Yoshihira, cut with a thick chisel toward the mune of the nakago; the tachi handed down in the Ii family is signed instead with a fine, small chisel and is singled out as "prime material for the study of Yoshihira"[[c:9]]. Among his works at the Kokuho rank there is one tempered with koshiba, though the published record adds that "this is not his usual practice"[[c:10]].

What separates him inside the school is carried by his own documented traits: a jigane that stands where his fellows' runs tighter, the kawazuko-choji that recurs through his grand register at a frequency he shares only with Sukezane, and a yakiba whose rises and falls are the form his variation takes. The published record also notes the general scale, observing that compared with contemporaries of the school "works of comparatively small scale are numerous"[[c:11]]. No pupils are recorded under his name; with Yoshifusa, his grandest works define the flamboyant peak of Fukuoka Ichimonji choji against which the later branches of the school and the Osafune choji smiths came to be measured.

Fujishiro grades him Jo-jo saku, and seventeen designated works stand on record: three Tokubetsu Juyo, seven Juyo, four Juyo Bijutsuhin and three Important Cultural Properties. The Important Cultural Properties are patrimony in shrine and public keeping, among them blades preserved at Futarasan Jinja and Tanzan Jinja. Nine blades carry recorded provenance. The roll runs through the Ii family of Hikone, whose almost ubu tachi, published in the Kozan Oshigata and the Umetada Meikan, keeps on its mune a kirikomi that speaks of service in battle, and onward through the Shimazu, Hachisuka, Maeda, Ikeda and Kishu Tokugawa families; the sayagaki of one mumei katana records it "presented by an old lord of Yamashiro"[[c:12]]. For a collector the realistic field is the ten blades of the Tokubetsu Juyo and Juyo tiers, and even there most pieces of recorded whereabouts rest in long-held private collections; a signed master of the Fukuoka Ichimonji at this rank reaches the open market only rarely, and a Yoshihira coming into open hands is a rare event.

The published sources count Yoshihira (吉平) among the smiths who represent the Fukuoka Ichimonji school of Bizen at its height in the mid-Kamakura period, and most genealogies record him as a grandson of Muneyoshi (宗吉) and a son of Yoshiie (吉家), which places him in the same brilliant generation as Yoshifusa, Sukezane and Norifusa. The swordsmith registers date his activity to around the Kangen era (1243 to 1247), while one designation text gives around Bun'o (1260). His standing within that company was fixed by Honma's judgment, preserved in the record of one of his Juyo Bijutsuhin tachi: among mid-Kamakura Bizen work, "the most flamboyant choji are tempered by Yoshifusa and this Yoshihira"[[c:1]]. Several signed tachi survive, and the same sources note that one of them holds the rank of Kokuho.

For his characteristic hand the published sources repeat a single formula: beside Yoshifusa or Sukezane his work shows less of the grand o-choji-midare, yet it abounds in change, and "one often sees examples in which the interior of the ha becomes laden with nie"[[c:2]]. That variation has a precise vocabulary. Into his choji-midare enter kawazuko-choji and fukuro-choji, gunome and occasional slightly pointed forms mix in, and the yakiba rises and falls conspicuously. Ashi and yo enter well, the nioi runs deep with fine ko-nie, and kinsuji and sunagashi work through the ha. His grandest pieces are described as "a style rich in variation, mixing fukuro, juka and kawazuko choji"[[c:3]], and on the Tokubetsu Juyo tachi of the twenty-first session the temper even turns saka-gakari over the lower half, a feature of which the NBTHK writes that there are "no comparable examples among Yoshihira's works"[[c:4]].

The jigane is an itame, in places mixed with mokume and flowing hada, and its inclination to stand is stated outright: compared with his contemporaries of the school, the published record observes, "the jigane also tends somewhat to stand"[[c:5]]. Ji-nie adheres, on the finest blades thickly and with chikei entering, and a midare-utsuri rises distinctly on nearly every recorded work. The boshi runs midare-komi and returns in ko-maru, at times taking a pointed tendency with hakikake; on some blades it is sugu with a yakitsume feeling.

Within this one manner the judges distinguish two registers. The quiet, small-patterned pieces lean from ko-choji toward suguha, with a tighter nioiguchi and an unusually even yakihaba; of one such Juyo Bijutsuhin tachi from the Hachisuka family, Honma remarks that it is "unusual for this smith in that the yakiba shows little difference in height, yet it is genuine"[[c:6]]. The grand register stands at the opposite pole, "as bustling as Yoshifusa"[[c:7]], and the mumei katana of the first Tokubetsu Juyo session was judged "even more flamboyant than the signed works"[[c:8]]. His mei is normally the two characters Yoshihira, cut with a thick chisel toward the mune of the nakago; the tachi handed down in the Ii family is signed instead with a fine, small chisel and is singled out as "prime material for the study of Yoshihira"[[c:9]]. Among his works at the Kokuho rank there is one tempered with koshiba, though the published record adds that "this is not his usual practice"[[c:10]].

What separates him inside the school is carried by his own documented traits: a jigane that stands where his fellows' runs tighter, the kawazuko-choji that recurs through his grand register at a frequency he shares only with Sukezane, and a yakiba whose rises and falls are the form his variation takes. The published record also notes the general scale, observing that compared with contemporaries of the school "works of comparatively small scale are numerous"[[c:11]]. No pupils are recorded under his name; with Yoshifusa, his grandest works define the flamboyant peak of Fukuoka Ichimonji choji against which the later branches of the school and the Osafune choji smiths came to be measured.

Fujishiro grades him Jo-jo saku, and seventeen designated works stand on record: three Tokubetsu Juyo, seven Juyo, four Juyo Bijutsuhin and three Important Cultural Properties. The Important Cultural Properties are patrimony in shrine and public keeping, among them blades preserved at Futarasan Jinja and Tanzan Jinja. Nine blades carry recorded provenance. The roll runs through the Ii family of Hikone, whose almost ubu tachi, published in the Kozan Oshigata and the Umetada Meikan, keeps on its mune a kirikomi that speaks of service in battle, and onward through the Shimazu, Hachisuka, Maeda, Ikeda and Kishu Tokugawa families; the sayagaki of one mumei katana records it "presented by an old lord of Yamashiro"[[c:12]]. For a collector the realistic field is the ten blades of the Tokubetsu Juyo and Juyo tiers, and even there most pieces of recorded whereabouts rest in long-held private collections; a signed master of the Fukuoka Ichimonji at this rank reaches the open market only rarely, and a Yoshihira coming into open hands is a rare event.