According to tradition the first Japanese sword blade was made by the swordsmith Amakuni Yasutsuna about the year 700. Amakuni, his son Amakura and a number of other smiths were employed by the emperor to make weapons for his warriors. One day the emperor and his warriors passed by Amakuni’s forge as they returned from battle, and instead of greeting Amakuni as he usually did, the emperor totally ignored Amakuni and all the swordsmiths. As the warriors straggled back Amakuni noticed that many of them were carrying broken swords; the weapons he had forged had snapped in the heat of battle. He closely examined the weapons and swore an oath to make a sword that would not break and so regain the emperors favour...
After forging, the smith would then sign his name on the tang and pass the blade onto specialist craftsmen who would polish the blade and fit the hilt, guard (tsuba) and other items of sword furniture. The finished blade was sometimes given to a professional sword tester who used the living bodies of condemned criminals or their corpses taken from the execution grounds to test the cutting power of a new sword. Twenty different cuts were used, beginning with severing the hand by cutting through the bones of the wrist and progressing through the thicker limbs of the body. The results of the test were usually recorded on the nakago or sword tang.
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