stylistic:style_transfer, information:filtering, information:classification
East Asia

As steel technology improved, single-edged weapons became popular throughout Asia. Derived from the Chinese jian or dao, the Korean hwandudaedo are known from the early medieval Three Kingdoms. Production of the Japanese tachi, a precursor to the katana, is recorded from c. AD 900 (see Japanese sword).

Japan was famous for the swords it forged in the early 13th century for the class of warrior-nobility known as the Samurai. Western historians have said that Japanese katana were among the finest cutting weapons in world military history. The types of swords used by the Samurai included the ōdachi (extra long field sword), tachi (long cavalry sword), katana (long sword), and wakizashi (shorter companion sword for katana). Japanese swords that pre-date the rise of the samurai caste include the tsurugi (straight double-edged blade) and chokutō (straight one-edged blade). Japanese swordmaking reached the height of its development in the 15th and 16th centuries, when samurai increasingly found a need for a sword to use in closer quarters, leading to the creation of the modern katana. High quality Japanese swords have been exported to neighboring Asian countries since before the 11th century. From the 15th century to the 16th century, more than 200,000 swords were exported, reaching a quantitative peak, but these were simple swords made exclusively for mass production, specialized for export and lending to conscripted farmers (ashigaru).