Variously Decorated Domaru (helmet, Cheek Guards, Large

Iroiro-odoshi Dōmaru: A Medieval War-Suit of the Sakai House

The lacing runs in bands of purple, crimson, and white down the chest of this armor. That arrangement of colors is what names the piece. Iroiro-odoshi means "multi-colored lacing," and it describes how the hundreds of small overlapping scales that form the cuirass are bound together with silk cords in several hues rather than one uniform color. The effect is precise rather than showy, the bands reading like horizontal stripes when you stand in front of it.

This is a dōmaru, a body armor that wraps around the torso and closes on the right side. It was made late in the Muromachi period, the era of warfare that filled the 15th and 16th centuries, and it survives as a complete set: the cuirass itself together with a helmet (kabuto), a face-and-cheek guard (hōate), a pair of large shoulder guards (ō-sode), and chain-and-plate gauntlets (kote). It is kept at the Chido Museum in Tsuruoka, on the Sea of Japan coast in Yamagata Prefecture.

A General's Armor, One Generation Early

By tradition the suit was worn by Sakai Tadatsugu (1527–1596). Tadatsugu was a senior retainer of Tokugawa Ieyasu, fifteen years older than his lord, and he is counted at the head of the warriors later honored as the Four Heavenly Kings of the Tokugawa. He won battles, served as an envoy to Oda Nobunaga, and earned the respect of Toyotomi Hideyoshi. The family he founded went on to govern the Shōnai domain from Tsuruoka, though that came later: the Sakai entered Shōnai only in 1622, more than two decades after Tadatsugu's death, so he never lived in the city where his armor now rests. The suit traveled north with the household's possessions and eventually passed to the museum.

That generational gap is the reason the armor matters. Ieyasu and the other Heavenly Kings belonged to a younger cohort, and the war-suits that survive from them are all tōsei-gusoku, the plate-based "modern equipment" that took over from the late 16th century onward. Tadatsugu, born earlier, left behind armor built the older way, from small scales and silk cord. Seeing his dōmaru beside the plate armor of the men who came after him lets you watch one technology give way to another. The Agency for Cultural Affairs designated it an Important Cultural Property on 19 February 1957, citing fine workmanship that shows clearly the character of Japanese armor in the years just before tōsei-gusoku appeared.

What Rewards a Close Look

The body is built from hon-kozane, true small scales of rawhide coated in raised black lacquer, laced into a torso that rises three tiers at the front and four at the back. Below it hangs the kusazuri, the protective skirt, here divided into eleven sections of five tiers. Where leather covers the metal fittings, it is dyed with a design of lions among peonies, edged in indigo leather, and studded with small cherry-blossom rivets under gilt rims. These are the parts a maker chose to dress carefully, and they reward standing close.

The helmet is the high point. Its bowl has the rounded akoda-nari profile, swelling toward the back like a gourd, and it is a suji-kabuto: twelve iron plates joined so their raised seams form thirty-two standing ribs across the surface, all under black lacquer with gilt rims. Gilt openwork fittings in chrysanthemum and arabesque patterns ring the crown. A three-pronged ritual fitting rises at the front, flanked by gilt kuwagata, the horn-like crest that reads as a pair of antlers from a distance. The neck guard falls in three tiers, the upper two flaring outward as fukikaeshi.

Look last at the face guard. It is iron worked in repoussé and finished as bare rusted metal, with a detachable nose-piece. A small flourish hides here: the mustache is rendered in silver, rubbed and inlaid into the iron, a touch of grim humor on a piece meant to frighten. A throat guard of four scaled tiers, laced in red, hangs beneath it. The shoulder guards run seven tiers each, the gauntlets are mounted on persimmon-dyed hemp, and the whole suit was conserved over the winter of 2017 to 2018 and shown again that autumn for the first time in roughly fifteen years.

Around the Museum

The Chido Museum occupies the former third bailey of Tsurugaoka Castle, just west of Tsuruoka Park, on ground that once held the Sakai lords' working residence. It is less a single building than a small compound: seven historic structures and a garden spread across the grounds. Several are Important Cultural Properties in their own right, including the former Nishitagawa District Office, the former Tsuruoka Police Station, and a multi-storey thatched farmhouse moved here from the mountain village of Tamugimata. The Sakai family garden, a rare shoin-style design for this part of the country, is a nationally designated Place of Scenic Beauty, and the museum holds large collections of regional folk tools that carry national protection. The site earned a star in the Michelin Green Guide Japon.

The armor is not the only Sakai relic here. The collection also includes two tachi swords designated National Treasures, both linked to Tadatsugu, and the celebrated dagger known as Shinano Tōshirō. Tsuruoka itself is reached on the JR Uetsu Main Line; from the station the museum is about seven minutes by taxi or a walk of roughly twenty minutes, and a bus toward Yunohama Onsen also passes nearby. Drivers reach it in about seven minutes from the Tsuruoka interchange on the Yamagata Expressway.