# Tachi, mei Sanjo (Meibutsu Mikazuki Munechika) > Sanjo Munechika - Traditionally dated to the Eien era, 987-989, during the reign of Emperor Ichijo; the Tokyo National Museum's own published cataloguing gives the wider range Heian period, 10th to 12th century > Canonical HTML: https://iconotheca.com/artworks/sanjo-munechika/mikazuki-munechika-tokyo-national-museum/ > Published by Servola Systems GmbH. Last verified: 2026-09-12 ## Tombstone - **Artist:** Sanjo Munechika - **Date:** Traditionally dated to the Eien era, 987-989, during the reign of Emperor Ichijo; the Tokyo National Museum's own published cataloguing gives the wider range Heian period, 10th to 12th century - **Medium:** Forged and folded steel (tamahagane), water-quenched to produce a hardened edge (hamon) over a softer core; gold and other metal fittings on the associated koshirae mounting - **Dimensions:** Blade length (nagasa) 79.9 to 80.0 cm depending on source; curvature (sori) 2.7 to 2.8 cm; width at the base (motohaba) 2.97 cm; width near the point (sakihaba) 1.47 cm; weight of the blade alone 673 g; with its ito-maki tachi koshirae mounting, overall length 98.1 cm and scabbard length 85.3 cm - **Object type:** Arms and armour - **Period:** Japanese, Heian period - **Current location:** Tokyo National Museum, Tokyo - **Attribution:** accepted ## Summary A signed tachi of the Heian period, forged by the swordsmith known as Sanjo Munechika and named for the crescent-shaped shimmer along its hardened edge. It is one of the Tenka-Goken, the Five Swords Under Heaven, a canon of celebrated blades attested in print since at least the late 17th century, and it carries the rare distinction among Tokugawa house treasures of being formally recorded as mudai, beyond ordinary price, in the shogunate's own 1719 register of famous swords.Its documented history runs confidently from 1624, when it passed on the death of Kodai-in, widow of Toyotomi Hideyoshi, to the Tokugawa shogunate, through three centuries of shogunal custody, a 1933 state designation, and a 20th-century private ownership by the collectors Nakajima Kiyoichi and Watanabe Saburo and Seiichiro, to a documented 1992 donation to the Tokyo National Museum, where it remains on periodic public display. Everything claimed for the sword before 1624, including its supposed role in a 16th-century shogun's last battle, rests on tradition that Japanese-language scholarship itself has shown to be partly undocumented and partly demonstrably wrong in its details.It is also, and this matters for anyone assembling a picture of the wider Tenka-Goken canon from partial or crossed sources, a different sword from Kogitsune-maru, the blade of Noh legend forged with the fox god of Inari, and a different sword again from the Honjo Masamune, the mumei blade attributed to Masamune already recorded elsewhere on this site. The three are frequently confused in casual retelling. None of the three is any of the others. ## Provenance Every link carries a grade. `documented` means a cited source supports it, `disputed` means the identification is argued but not established, `unknown` means we have no owner for that span and have not bridged it. - **traditionally 987-989** Origin: forged by the swordsmith signing as Sanjo (identified with Sanjo Munechika) `[documented]` (origin) The blade carries a genuine, unaltered (ubu) tang with a chiselled two-character signature reading Sanjo, placed unusually on the haki-ura face. The signature and the ubu tang are documented physical facts; the swordsmith's precise biographical dates and life are traditional, resting on later genealogies rather than a contemporary record. - **987-989-1489** Unknown `[disputed]` (gap, with contested tradition) Popular accounts place the sword with Hino Uchimitsu at the 1527 battle of Keisho-ji, then with Hatakeyama Tokuzen who is said to have dedicated it at Mount Koya, then with the 13th Ashikaga shogun Yoshiteru at his 1565 death in the Eiroku Incident, then with the Miyoshi family, and briefly with the retainer Yamanaka Shikanosuke. Careful Japanese-language sourcing on the object shows the Hatakeyama dedication cannot be true as told (he died in 1522, five years before the battle it is tied to), shows that near-contemporary accounts of the 1565 incident name no specific sword, and traces the family-heirloom version of that story to a dramatized late Edo-period history rather than a primary record. This record treats the entire pre-1624 chain as unconfirmed tradition, not as documented fact. - **-1624** Kodai-in (Nene), widow of Toyotomi Hideyoshi `[documented]` (confirmed possession at death) Kodai-in is confirmed as the sword's owner at the time of her death in 1624; her own prior acquisition of it is not independently documented in the sources consulted. - **1624-1933** Tokugawa shogunal family `[documented]` (bequest and continuous family custody) Bequeathed on Kodai-in's death to the second shogun, Tokugawa Hidetada, and retained by the shogunal family. Formally designated an Old National Treasure on 23 January 1933 under Japan's pre-war National Treasure Preservation Law, in the name of Tokugawa Iesato, 16th head of the family line. A separate, less-detailed source claims the sword was sold out of the family during the Meiji era; this record could not reconcile that claim with the documented continuity of Tokugawa custody up to 1933 and does not present it as established. - **1933-1951** Passed to a private collectors' circle, exact date and mechanism disputed `[disputed]` (transfer out of the Tokugawa family) Three inconsistent accounts circulate: transfer via a financier after the war's end; a c. 1937 transfer from the collector Nakajima Kiyoichi to Watanabe Saburo after sustained persuasion, arising from the connoisseurship circle around Honma Kunzan; or a 1946 chance purchase by Watanabe at a Shinjuku antique dealer. None is independently corroborated; one is sourced only to a 2016 popular book on the sword. - **1951-1992** Watanabe Seiichiro `[documented]` (National Treasure designation in his name, then private ownership) Designated a National Treasure on 9 June 1951 under Japan's postwar Law for the Protection of Cultural Properties, in the name of its then owner, Watanabe Saburo's son Watanabe Seiichiro, who held it privately for a further four decades. - **1992-present** Tokyo National Museum `[documented]` (donation) Donated by Watanabe Seiichiro to the Tokyo National Museum in November 1992 (Heisei 4), together with other important swords from the family collection, in fulfilment of his late father's wishes. The museum's own exhibition listings and a 2021 public-relations announcement both credit the piece as a gift of Mr. Watanabe Seiichiro, matching the donor and approximate date given by Japanese-language sources. ## Open questions - How did Kodai-in (Nene) herself first come to own the sword before her confirmed possession of it at her death in 1624? No source consulted establishes this. - Did the sword really belong to the 13th shogun Ashikaga Yoshiteru and figure in his last stand in the 1565 Eiroku Incident, as popular accounts state, given that the near-contemporary chronicle and missionary accounts of that battle name no specific sword and the family-heirloom detail traces only to a later, dramatized Edo-period history? - Was the sword sold out of Tokugawa family hands during the Meiji era, as one popular source states, or did it remain in continuous family custody up to its documented 1933 Old National Treasure designation under Tokugawa Iesato? The two claims are not reconcilable on the sources available. - By what route and in what year did the sword actually pass from the Tokugawa family to the 20th-century collectors' circle around Nakajima Kiyoichi and Watanabe Saburo? Three different, mutually inconsistent accounts circulate and none is independently corroborated. - What is the sword's confirmed Tokyo National Museum accession number? A single secondary source gives F-20103; this record could not verify that figure against a document published directly by the museum. - Is the crescent-moon doubling in the hamon that gives the sword its name substantially a product of a thousand years of polishing rather than of the smith's original intent, as specialist commentary suggests? If so, the sword's most famous visual feature may be an artifact of its own long survival rather than of its making. ## Sources - [1] Tokyo National Museum, exhibition item listing for the National Treasure tachi mei Sanjo (Mikazuki Munechika), crediting it as a gift of Mr. Watanabe Seiichiro. - [2] e-Museum (eKokuho), National Institutes for Cultural Heritage, official record for Long sword signed Sanjo (celebrated Mikazuki Munechika), giving dimensions and designation status. - [3] Japanese Wikipedia, 'Mikazuki Munechika' (three sun moon Munechika), consolidating designation dates, the disputed pre-1624 tradition with its own debunking footnotes, and the 1992 donation account. A well-footnoted tertiary source; flagged for replacement with the academic and museum-catalogue literature on the sword where it can be obtained. - [4] English Wikipedia, 'Tenka-Goken', for the naming and dating of the Five Swords Under Heaven as a canon and the list of all five blades. - [5] Meihaku (Japan Sword Museum), 'Mikazuki Munechika' reference page, for technical measurements, mei placement and hamon and jihada description. A popular institutional-adjacent tertiary source; flagged for replacement with a primary NBTHK or museum publication. - [6] Touken World, 'Tenka Goken Mikazuki Munechika', for the Kyoho Meibutsu-cho entry and valuation, and for the unconfirmed Meiji-era sale claim. A popular tertiary sword-history site; flagged for replacement with a primary source where the Meiji-sale claim can be checked. - [7] Markus Sesko, 'Kantei 4 - Yamashiro #1 - Sanjo School 1', for kantei difficulty, school characteristics, and technical description of Mikazuki Munechika specifically. - [8] Wikimedia Commons API, imageinfo and extmetadata for the five candidate image files, used to verify licence terms (CC BY 4.0 for the ColBase files, public domain for the 1938 National Diet Library and 1952 Portfolio of National Treasures photographs) and credited authorship directly rather than relying on a prior summary. - [9] The Noh Plays Database (the-noh.com), synopsis of 'Kokaji (The Swordsmith)', for the Inari-fox legend concerning the separate sword Kogitsune-maru. - [10] Katanamart blog, 'Kogitsunemaru: The Legendary Sword Forged with a Fox Spirit', for narrative detail on the Kokaji legend. A popular tertiary source; flagged for replacement with a scholarly edition of the Noh play or a dedicated study of Inari-cult smith legends. - [11] SoraNews24, 'Legendary crescent moon katana, one of Japan's Five Swords Under Heaven, now on display in Tokyo' (21 July 2017), for the 2017 display dates and the one-photograph queue rule imposed on Touken Ranbu fans. - [12] Nihon Bijutsu Token Hozon Kyokai (NBTHK) American Branch #2, 'Touken Joshi', for the wider Touken Ranbu reception phenomenon, the 2018 Kyoto visitor demographics, and the organisation's own response to its new audience. --- Images on this record are public domain or CC0 and are hosted by us. No image on this site is generated or simulated. If you quote this record, quote the provenance grades with it.