//Muromachi Period (1393 - 1573)
  • Thin iron tsuba of round form with design of family crests (mon) and arabesque (karakusa) in brass or copper inlay (suemon-zōgan) and occasional scattered brass dots or nail heads in ten-zōgan. Seppa-dai outlined with brass wire in the shape of a rope; kozuka-hitsu-ana outlined with scalloped brass wire. Rounded rim with iron bones (tekkotsu). The surface covered with lacquer (urushi). Ōnin school. Late Muromachi period, 16th century. Family crests on the face: 1:30: Two lines (double stripe) encircled (maruni futatsu biki). 4:30: Stylized clove (choji). 7:30: Divided rhombus, or four lozenges incorporated in one (wari-bishi); it is also called Takeda-bishi, the family crest of warrior Takeda Shingen (among the others). 10:00: Stylized Genji-mon (Genji kō-zu) or incense symbol. On the reverse: 2:00 - "Chinese cloud" not a crest. 5:00: Bit (Kutsuwa) 7:30: Number four in a fan (ōgi-san) 10:30: Two dots in a well frame (igeta).      
  • Iron tsuba of round form profusely decorated with brass inlay of plants, birds, well, and family crests (mon) in suemon-zōgan technique and occasional brass dots (nail-heads) or ten-zōgan. Seppa-dai and kozuka-hitsu-ana outlined with brass inaly, possibly repaired: rope-shaped wire here and there replaced with flat wire. The plate is very thin, with remnants of lacquer. Ōnin school. Size: 75.8 x 75.2 x 2.3 mm. Weight: 77.5 g. On the front side (omote) motif includes the following elements (from 12 o'clock, clockwise):
    1. Water plantain (a.k.a. arrowhead, or omodaka): "a perpetual plant of the water plantain family, was also called shōgunsō (victorious army grass). Because of this martial connotation, it was a design favored for the crests of samurai families" [see: Family Crests of Japan. // Stone Bridge Press, Berkeley, CA, 2007; p. 63].
    2. Heron (sagi): "...considered an emblem of longevity, and from China comes the practice of regarding the bird as a mount of the gods and the Taoist sennin. [...] heron also reflects an inauspicious connotation, for the word sagi is homophone for 'fraud' and 'false pretenses'." [see: Merrily Baird. Symbols of Japan. Thematic motifs in art and design. // Rizzoli international publications, Inc., 2001; p. 112]. Some may say, that this is not a heron but a crane (tsuru). It's very possible, and in this case the negative connotation is lost, but the reference to longevity and allusion to sennin remain.
    3. Pampas grass (susuki, or obana): as per Merrily Baird, p. 95 and John W. Dower, p. 66, pampas grass is one of the Seven Grasses of Autumn. When combined with flying wild gees, conveys strong autumnal mood.
    4. Plum blossom (ume): according to Merrily Baird, the flower has a vast variety of symbolic meanings, including longevity, and a reference to the Chinese Taoists. It is used in 80 family crests [see: Japanese Design Motifs: 4,260 Illustrations of Japanese Crests; Compiled by the Matsuya Piece-Goods Store; Translated by Fumie Adachi. // Dover Publications, Inc., 1972.] Plum is "celebrated for its sweet perfume, delicate blossoms, and habit of blooming at the end of winter".
    5. Tree flying wild geese (kari): "Wild geese arrive in large flocks in southern regions during the autumn months, and following their migratory instincts, head back north in spring" [Family Crests of Japan, pp. 85-86]. "The importance of geese in Japanese art was further secured by stories of several military heroes who had achieved victory in battle when a sudden breaking of ranks by flying geese signaled an ambush. The protective role of the birds led to their frequent use in decorating sword furnishings and possibly also their adoption as a family crest motif.Finally, the goose in Asia plays a role in religious traditions" [Merrily Baird, pp.111-112].
    6. Hikiryō (line, or bar, or stripe) - a symbol which consists of one, two, or three horizontal or vertical stripes in a circle. "In wartime, Japanese generals [...] surrounded their encampments with huge cloth curtains. Usually these were made of cloth sewn together horizontally and varying in color [...] to distinguish the individual general and his followers. The stripe thus assumed strong martial connotations, and became a mark of identification on personal military gear as well. In the early fourteenth century  the heads of the Ashikaga and Nitta, then the two most powerful clans in Japan, both adopted stripe patterns as a family crest". [See: Family Crests of Japan, p. 111 and John W. Dower. The elements of Japanese design - A handbook of family crests, heraldry & symbolism. // Weatherhill, New York, Tokyo, 1985, p. 144].
    On the reverse (ura) motif includes the following elements (from 12 o'clock, clockwise):
    1. Hikiryō, see above.
    2. Pampas grass (susuki, or obana), see above.
    3. Bellflower (kikyo): One of the Seven Grasses of Autumn. "As a crest, it have been adopted among the warriors around the thirteenth century, primarily because of it's beauty" [John W. Dower, p. 48].
    4. Four flying wild geese (kari), see above.
    5. Weeping willow (yanagi): "It is commonly represented with water, snow, swallows, or herons.  A branch of willow (yoshi) is one of the attributes of the Buddhist deity Senju Kannon (Thousand-Armed Kannon), who is said to use the branch to sprinkle the nectar of life contained in a vase. [Merrily Baird, pp. 66-67].
    6. Lone plum blossom in a well frame/crib (igeta, izitsu): "Well crib was one of the most popular motifs in Japanese heraldry".  As a crest it may stay simply for the first character (i) of the family name, however, with a flower inside the well frame, and together with the other symbols present, it may aggravate the sense of autumn-ness. The ten-zōgan dots in this particular case may represent the snowflakes or autumn stars.
    The beholder may imagine a high-ranking samurai resting near a river or lake after the battle. Surrounded by clusters of pampas grass, he's watching a flock of geese flying in the skies; it is late in the autumn, and the occasional snowflakes hover around; heron is walking amidst the arrowheads, hunting for food. The last lonely plum blossom floating in a well... According to Gary D. Murtha, this type of tsuba "could be considered as Onin or as early Heianjo work. The brass trim around kozuka hitsu-ana and the seppa-dai are characteristics of Onin work [see: Japanese sword guards. Onin - Heianjo - Yoshiro. Gary D. Murtha. GDM Publications, 2016; p. 27].  
  • A yamagane  (unrefined copper) ko-kinko tsuba of slightly elongated round form with design of wisteria carved in sculptural relief (nikubori). Copper sekigane. Unsigned. Muromachi period, likely the 16th century.

    Size: 74.3 x 71.8 x 3.2 mm.

    NBTHK certificate №4003986: Hozon (worthy preservation). In custom wooden box.
  • Iron tsuba of round form with design of two paper lanterns in openwork (small cut-outs, ko-sukashi ) outlined with brass wire. The plate is decorated with four concentric rows of brass dot inlay (ten-zōgan), with a brass circular wire inside the innermost row of dots (missing on the back). Hitsu-ana of rectangular form is not outlined with brass wire, which let us suppose that it was cut out at a later date. Copper sekigane. Mid Muromachi period (1454-1513). Diameter: 74.0 mm, thickness: 2.6 mm. Tsuba is illustrated at: 新版 日本刀講座 小道具鑑定編 本間 薫山 佐藤 寒山 : Shinhan Nihonto Koza, Volume VI, Kodogu Part 1. Under supervision of Honma Kunzan and Sato Kanzan. 鍔 無名 応仁 鉄地) 丸形 小透 槌目 真鍮据文 点象嵌 丸耳 : Tsuba with no signature, Ōnin style. Base metal iron (jigane), round shape, small perforations (ko-sukashi), hammering finish (tsuchime). Pre-cast brass inlay (shinchu suemon-zōgan); dot inlay (ten-zōgan); round edge (maru-mimi). English translation of the book indicated above Nihon Tō Kōza, Volume VI, Part 1 by Harry Afu Watson, AFU Research Enterprises, Inc., 1993. Tsuba in question illustrated on page 14 and described as follows: " Tsuba mumei Ōnin. Tetsu ji maru gata ko-sukashi tsuchime shitate shinchū suemon ten zogan maru mimi. Brass suemon". My question remains: why such a text is called 'translation' while it looks more like transliteration of romanization?
  • Iron tsuba of round form with design of two parallel crossbars and two rings in openwork (sukashi). Rounded square rim. Moderate iron bones (tekkotsu) allover. Copper sekigane. Kanayama school. Momoyama period (or late Muromachi). Size: 74.5 x 74.0 x 5.5 mm. The rings possibly represent the sun and the moon, or the stars. The parallel crossbars may represent the "two stripes" (futatsu biki) family crest (incl. Ashikaga family).
  • Iron tsuba of round form decorated with inlay of four concentric rows of brass dots or nail heads (ten-zōgan) and a circular brass wire inlay inside the innermost row of dots. Copper sekigane. Muromachi period, 15th or 16th century. Unsigned. Ōnin school. Size: 87.9 x 87.8 x 2.2 mm. Ōnin school got its name from the Ōnin War (応仁の乱 - Ōnin no Ran) - a civil war that lasted 10 years (1467–1477) during the Muromachi period in Japan.
  • Ko-kinko ymagane cast tsuba of oval form with chiseled diaper pattern of double head waves on both sides and a rabbit cast and carved with its eye inlaid in yellow metal (gold or brass) on the face. Fukurin which holds together the sandwiched layers of metal (sanmai) is about 2.7 mm wide. Possibly, early Mino (ko-Mino) school. Size: 66.6 x 59.9 x 4.0 mm. Some connoisseurs believe that this kind of tsuba was in mass production at the time. Small animal believed to be a fox, however some attribute it to a long-tailed rabbit or a squirrel. I am leaning towards the rabbit. Similar example is found at Robert E. Haynes Catalog №3, April 9-11, 1982 on page 11, under № 15: “Rare design in style of Sanmai (three layers) / Wasei work. With yamagane core and heavy rim cover. The web plates are carved with double head Goto style waves and the face has a fox. The web plates were riveted at the seppadai.  See Lot 4, page 8. Ca. 1350. Ht. 6.6 cm, th. 3 mm” [underscore mine]. Quality of photo is so poor that I decided not to provide it here. The only difference betwen my tsuba and his is that his has a square hole on the right shoulder of the seppa-dai. Early Muromachi (if we follow Robert it is even Nanbokucho, 1337-1392) or Momoyama period. The Momoyama attribution is mostly based on a fact that “waves and rabbit” motif became most popular in Momoyama times. Mokkōgata tsuba of similar design in this collection - see TSU-0282.

    TSU-0282: Ko-kinko yamagane tsuba with waves and rabbit motif.

     
  • Iron tsuba of round form with design of rudder, paddle, and stars in small openwork (ko-sukshi) outlined with brass wire, and further decorated with inlay of five concentric rows of brass dots or nail heads (ten-zōgan) and circular brass wire inlaid inside the innermost row of dots. Two lower round openings may also serve as udenuki-ana. Copper sekigane. Unsigned. Late Muromachi or Momoyama period, 16th century. Diameter: 90.4 x 89.8 x 2.8 mm.
  • Iron tsuba of slightly elongated round form decorated with design of melon flowers, vines, and leaves in brass flat inlay (hira-zōgan) on both sides. Slightly raised rim (mimi) carved in a way to simulate ring-shaped covering (fukurin). Kozuka hitsu-ana and kogai hitsu-ana both plugged with soft metal (tim or lead). Copper sekigane. Heianjō or Kaga School. Muromachi or Momoyama period, 16th century. Iron, hira-zōgan brass inlay. Round (maru gata) form, diameter 79 mm. Size: 80.3 x 78.4 mm; thickness at seppa-dai: 3.4 mm; at the middle: 3.8 mm; before the rim: 2.4 mm, rim: 2.8 mm. Note on design: though this design resembles family crests with oak and mulberry leaves, I believe it's  a melon flower [see Jeanne Allen. Designer's guide to Samurai Patterns. Chronicle Books, San Francisco, 1990, page 114, №130 "Melon Flowers":

    Jeanne Allen. Designer's guide to Samurai Patterns. Chronicle Books, San Francisco, 1990. Page 114, №130.

    Note about the distribution of thickness (niku-oki): "this tsuba has toroid features, niku raises from the rim towards the centre but thins once more out when approaching the seppa-dai" [M. Sesko, "Handbook...", p. 48].
  • Iron tsuba of round form with design of military commander's fan (gunbai) in openwork (sukashi). Square rim. Hitsu-ana plugged with lead or tin. Ko-tosho school. Mid-Muromachi period (1454-1513), Entoku era (1489-92) / Meio era (1489-1501). Height: 80.3 mm, Width: 81.5 mm, Rim thickness: 3.0 mm. Centre thickness: 3.5 mm. Provenance: Sasano Masayuki Collection,  №23 in Japanese Sword Guard Masterpieces from the Sasano Collection, 1994: Ko-tosho. Sukashi design: Military commander's fan (gunbai). Mid Muromachi period. Late 15th century (Entoku / Meio era). The military commander's fan (gunbai) was cherished by samurai warriors. This tsuba is relatively thick, with the large fan nicely positioned on the plate.
  • Iron tsuba of round form decorated with design of moon, stars, cloud, snowflake, gorintō, and Genji-mon in negative openwork (in-sukashi). Raised tubular rim (dote-mimi). Deep black patina, traces of lacquer. Naka-daka type of plate (thicker in center, getting thiner towards the rim). Visible gap between the rim and the plate. Dimensions: Height: 91.7 mm; Width: 90.8 mm; Thickness at seppa-dai: 2.5 mm, plate before rim: 2.2 mm, of the rim: 5.6 mm. At least Mid Muromachi period, 15th century, but possibly earlier. In 'Silver Book', commenting tsuba №34 Sasano writes: "The technique used to create the rim is the same used for the peak (koshimaki) of helmets (kabuto) during the Kamakura and Nanbokucho periods." On the other hand, the abundance of sukashi elements points towards later times, perhaps late Muromachi or even Momoyama period. "Gorintō is a grave stone composed of five pieces, piled on one the other, representing, from the bottom upward, earth, water, fire, wind, and heaven, respectively" [Nihon Tō Kōza, Volume VI, Part 1.  AFU, 1993, p. 6. / LIB-1554]. A romantic description of the piece may look like this: The air is scented (incense symbol); it's a graveyard, marked by gorintō; a winter (snowflake) evening or night (moon, stars); mist is rising from a ravine towards moon. I did not manage to find a katchūshi piece of this design, only a few Kamakura-bori tsuba:

    100 selected tsuba from European collections. Catalogue by Robert Haynes and Robert Burawoy, 1984, page 16, №5.

     

    Japanese Sword Fittings. Collection of G.H. Naunton, Esq., by Henri L. Joly, - 1912; №9.

    While the upper tsuba is dated the end of Muromachi, the lower is attributed to the 17th century - Momoyama or early Edo period, though the author put this attribution under question. Deciphering of the strangely shaped opening to the left of nakago-ana is sometimes "a conventional scroll", and sometimes - a fern or bracken. I think mine is a cloud or mist, but I don't have any material evidence to prove this understanding, and I came to a conclusion based only on context. It may easily be dinosaurs playing ball. The fact that this thing always accompanies the Genji-mon, or incense symbol, it may be a scent itself.
  • Iron tsuba of round form decorated with two boar's eyes (inome) and two dragonflies (tombo) in small openwork (ko-sukashi) outlined with brass wire. The plate also decorated with 2 to 5 concentric circular rows of brass dots (nail heads) in ten-zōgan. Center of the plate outlined with the inlaid circular brass wire. The inlaid metal is of red-ish hue, so it may be copper, and not brass. The surface has remnants of lacquer. Ōnin school. Mid Muromachi period, middle of 15th century. Dimensions: Diameter: 90 mm, thickness: 3.2 mm. Notes regarding design: "According to various sources, the dragonfly (tombo) is emblematic of martial success, as various names for the insect are homophones for words meaning "victory". The dragonfly is also auspicious because references in the Kojiki and Nihongi link it in both name and shape to the old kingdom of Yamato."  [Merrily Baird. Symbols of Japan. Thematic motifs in art and design. Rizzoli international publications, Inc., 2001, p. 108]. "The dragonfly (tonbo), was also called kachimushi in earlier times, and due to the auspicious literal meaning "victory bug" of the characters of this word it became a popular theme on sword fittings." [Iron tsuba. The works of the exhibition "Kurogane no hana", The Japanese Sword Museum, 2014, p. 13]. Two other cutouts - in the form of what in European tradition symbolizes the heart, on the top and in the bottom of tsuba disc - may have two different explanations. The most usual one, inome - "Heart-shaped pattern, which is said to go back to the shape of a wild boar's eye" [Markus Sesko. Encyclopedia of Japanese Swords. Print and publishing: Lulu Enterprises, Inc., 2014.]. This understanding is shared by Robert Haynes [Robert E. Haynes. Study Collection of Japanese  Sword Fittings. Nihon Art Publishers, 2010.] and elsewhere, with an exception of Okabe-Kakuya [Okabe-Kakuya. JAPANESE SWORD GUARDS. Museum of Fine Arts, Boston. In cooperation with the department of Chinese and Japanese art; - 1908, p. 14], who provides the illustration of inome-shaped cut-outs with the following explanation: " The tsuba shown in Fig. 13 approaches a square form with rounded corners and is perforated with Aoi decoration. But this book was written long time ago, when people even at MFA might not know enough... The same interpretation of the said heart-like symbol (aoi leaf) is given at Helen C. Gunsaulus. Japanese sword-mounts in the collection of Field Museum. // Publication 216, Anthropological Series, Volume XVI; Chicago, 1923; p. 54: "This mokkō-formed tsuba recalls the aoi form, perforated as it is with the four aoi leaves." It is possible that the "wild boar's eye" theory was developed by later scholars.   There is also a theory, supported by Graham Gemmell, saying that: “In simple terms Onin works are decorated Ko-Katchushi tsuba. … But, not content with iron alone, they began to decorate it with what was, in the early Muromachi period, a rare and valuable metal, brass. The Onin workers cut the design into the iron, using narrow channels, cast the brass, piece by piece, and then hammered it into the iron plate as though they were putting together a jigsaw. When complete the tsuba would be black lacquered exactly as the plain iron ones had been, the brass shining dully through it in a way that fulfilled the goal of shibui or restrained elegance.” [Tosogu. Treasure of the samurai. Fine Japanese Sword Fittings from The Muromachi to The Meiji Period, by Graham Gemmell. // Sarzi-Amadè Limited, London, 1991. An exhibition held in London from 21st March to 4th April, 1991]. The following illustration from Helen C. Gunsaulus. Japanese sword-mounts in the collection of Field Museum. // Publication 216, Anthropological Series, Volume XVI; Chicago, 1923; pp. 43 supports the idea. Helen C. Gunsaulus' description of the dragonfly emblem is as follows: "This motive, the dragon-fly  (akitsu), is generally accepted as a symbol of the kingdom of Japan, and the origin of the idea is traced to the legend recounted in the Kojiki and Nihongo of the Emperor Jimmu's view of the island from mountain top. He is said to have thought the kingdom looked like a dragon-fly touching its tail with its mouth. From this it received its name Akitsu-shima... etc."  
  • Iron tsuba of round form decorated with floral motif in brass or copper inlay (suemon-zōgan) and family crests (mon) in small openwork (ko-sukashi). Occasional brass dots or nail heads in brass ten-zōgan. Sukashi elements outlined with inlaid brass wire. Seppa-dai outlined with rope-shaped brass wire (nawame-zōgan); kozuka-hitsu-ana outlined with scalloped brass wire. Ōnin school. Mid to late Muromachi period, 15th or 16th century. Height: 88.9 mm; Width: 88.5 mm; Thickness at seppa-dai: 2.9 mm. Family crests (mon) in openwork: cherry blossom (sakura) - kamon of Sakurai and Yoshino clans, four-section lozenge (waribishi) - kamon of Takeda clan, the seven stars of the big dipper (maru ni nanatsuboshi) - kamon of Chiba clan, two encircled stripes (futatsubiki) - kamon of Ashikaga clan. Brass inlays represent flowers, branches and leaves, as well as halved plum blossom, halved chrysanthemum blossom, cloud, and chrysanthemum-on-water symbol - the mon of Kusunoki Masashige. Abundance of family crests of so many powerful warrior clans symbolizes heritage. "The brass trim around the kozuka hitsu-ana andd the seppa-dai are characteristics of Onin work" [Japanese sword guards. Onin - Heianjo - Yoshiro. Gary D. Murtha. GDM Publications, 2016; p. 27.]
  • Iron tsuba of mokko form (quatrefoil) decorated with a pair of cherry blossoms (sakura) in small openwork (ko-sukashi) and inlaid in brass (suemon-zōgan) with designs of waves, distant pines, chrysanthemum flowers in halves, tendrils and leaves, lightning or thunder symbol (inazuma), flying geese and family chrests (mon): two interlocked rings (wachigai) on the face, and three encircled stripes (maru-no-uchi-ni-mitsuhikiryo) - kamon of the Kikkawa clan  - on the reverse. Hitsu-ana outlined with inlay of brass wire. Surface treated with lacquer. Copper sekigane. Though some consider this type of tsuba to resemble Heianjo school, “...the brass trim around the hitsu-ana is a characteristics of Ōnin work” [Japanese sword guards. Onin – Heianjo – Yoshiro. Gary D. Murtha. GDM Publications, 2016; p. 27.]. The Ōnin origin is reinforced by scattered ten-zōgan elements here and there through the plate. It is possible that the tsuba was initially of round form and later trimmed to mokko shape. Mid Muromachi period; 15th century. Dimensions: Height: 87.2 mm; Width: 87.9 mm; Thickness at seppa-dai: 3.6 mm.
  • Iron tsuba of round form decorated with chrysanthemums, pine cones and needles, pampas grass, vines, cherry blossoms, and wild geese in brass inlay (suemon-zōgan) and pierced with designs of water clover (denjiso) and half bellflower (or karahana) to the left and to the right of nakago-ana as well as double bars above and below nakago-ana (possibly with the meaning of number 2 or ordinal 2nd). Most probably the sukashi elements here are the family crests (mon). Unsigned. Ōnin school. Muromachi period; 15th or 16th century. Height: 82.1 mm; Width: 80.9 mm; Thickness at seppa-dai: 2.4 mm NBTHK # 2003827: Tokubetsu Hozon Tosogu Kanteisho (特別保存刀装具鑑定書) - "Extraordinarily Worthy of Preservation".
  • Iron tsuba of round form with a butterfly (left) and dragonfly (right) design in openwork (sukashi), outlined with brass wire. The thin plate is also decorated with five concentric circular rows of brass dots (nail heads) in ten-zōgan; brass wire outlines the centre of the plate. School: Ōnin ten-zogan. Late Muromachi period, 16th century. Diameter: 88 mm, thickness at seppa-dai: 3.1 mm. Another tsuba of similar design, Tōshō school, is illustrated in this collection; see TSU-0353.2018. The design is referenced in LIB-1359.2017 Japanese Swords and Tsuba from the Professor A. Z. Freeman and the Phyllis Sharpe Memorial collections, Sotheby's, London, Thursday, 10 April 1997; p. 18, item 37: "pierced with two large formalised butterflies..."

    A Kamakura-bori tsuba of octagonal form, Momoyama period

  • Iron tsuba of round form with design of water plantain (omodaka) and wild goose in openwork (sukashi). Slightly rounded, square rim. Copper sekigane. Kyo school. Late Muromachi period: Early 16th century (Tenbun era) [Sasano's attribution]. Height: 76.2 mm. Width: 75.8 mm. Rim thickness: 5.3 mm. Center thickness: 4.5 mm. Provenance: Sasano Masayuki Collection, № 68: "The water plantain (omodaka) first appeared as a design for sword fittings in the Heian period. From such early beginnings, this decorative plant has shared a long history with the samurai. Also known as shogun's grass (shogununso), it was held in high esteem as a symbol of victory". The same tsuba was found at Japanese Swords and Tsuba from the Professor A. Z. Freeman and the Phyllis Sharpe Memorial collections. Sotheby's, London, Thursday 10 April 1997, page 22, item 60, saying that this is a "Kyo-sukashi tsuba, early to middle Edo period (late 17th/18th century) [Sotheby's attribution], and that it represents "a small bird among omodaka and aoi plants".  
  • Iron tsuba of round form with design of diamond-shaped family crest (waribishi-mon) in openwork (sukashi). Bevelled, raised rim. Kozuka-hitsu-ana plugged with tin or lead. Ko-Katchushi school. Early Muromachi period: Early 15th century (Oei era). Size: Height: 89.3 mm. Width: 89.0 mm. Rim thickness: 4.3 mm. Center thickness: 2.9 mm. Provenance: Sasano Masayuki Collection, № 41: "In this tsuba, a family crest incorporating four lozenges sits upright on the right side of the nakago-ana. The straight lines of the lozenge add substance and power. Initially, the crest creates confusion regarding the age, yet the overall impression is one lacking in vigor and probably dates rather later than Nanbokucho period".