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Amongst the Warring States period swords, some unique technologies were used, such as casting high tin edges over softer, lower tin cores, or the application of diamond shaped patterns on the blade see sword of Goujian.Although iron swords were made alongside bronze, it was not until the early Han period that iron completely replaced bronze.The spatha type remained popular throughout the Migration period and well into the Middle Ages.Vendel Age spathas were decorated with Germanic artwork not unlike the Germanic bracteates fashioned after Roman coins.Non-European weapons called "sword" include single-edged weapons such as the Middle Eastern scimitar , the Chinese dao and the related Japanese katana.The Chinese jian is an example of a non-European double-edged sword, like the European models derived from the double-edged Iron Age sword.Historically, the sword developed in the Bronze Age , evolving from the dagger; the earliest specimens date to about BC.
Around the 10th century, the use of properly quenched hardened and tempered steel started to become much more common than in previous periods.In South Asia earliest available Bronze age swords of copper were discovered in the Harappan sites, in present-day Pakistan, and date back to BC.Iron became increasingly common from the 13th century B. The iron was not quench-hardened although often containing sufficient carbon, but work-hardened like bronze by hammering.One of the most important, and longest-lasting, types swords of the European Bronze Age was the Naue II type named for Julius Naue who first described them , also known as Griffzungenschwert lit. During its lifetime, metallurgy changed from bronze to iron , but not its basic design.Swords coming from northern Denmark and northern Germany usually contained three or more fake rivets in the hilt.