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Portal:Ancient Japan/Selected lists/3

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Blades, from left to right: naginata, tsurugi, tantō, uchigatana and tachi (not to scale)
Blades, from left to right: naginata, tsurugi, tantō, uchigatana and tachi (not to scale)

The term "National Treasure" has been used in Japan to denote cultural properties since 1897. The definition and the criteria have changed since the inception of the term. The weapons in this list of swords designated as National Treasures of Japan span from the late Kofun to the Muromachi period.

During the Yayoi period from about 300 BC to 300 AD, iron tools and weapons such as knives, axes, swords or spears, were introduced to Japan from Korea and China. Shortly after this event, Chinese, Korean, and eventually Japanese swordsmiths produced ironwork locally. Swords were forged to imitate Chinese blades: generally straight chokutō with faulty tempering. Worn slung from the waist, they were likely used as stabbing and slashing weapons. Swordmaking centers developed in Yamato, San'in and Mutsu where various types of blades such as tsurugi, tōsu and tachi were produced.

Flat double-edged (hira-zukuri) blades originated in the Kofun period, and around the mid-Kofun period swords evolved from thrusting to cutting weapons. Ancient swords were also religious objects according to the 8th century chronicles Nihon Shoki and Kojiki. In fact, one of the Imperial Regalia of Japan is a sword, and swords have been discovered in ancient tumuli or handed down as treasures of Shinto shrines or Buddhist temples. Few ancient blades (jokotō) exist because the iron has been corroded by humidity. The transition from straight jokotō or chokutō to deliberately curved, and much more refined Japanese swords (nihontō), occurred gradually over a long period of time, although few extant swords from the transition period exist.

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