Japanese Katana are inspired/straight out a copy of Tang Dynasty (China) swords/sabres for cavalry. There are sources online, I have posted them on reddit but too lazy to find them again. Japanese had to use the folding technique bc Chinese Dynasties banned the export of weapon material including iron and Japans iron ores suck ass.
Reminder:
Japanese Katana are inspired/straight out a copy of Tang Dynasty (China) swords/sabres for cavalry. There are sources online, I have posted them on reddit but too lazy to find them again. Japanese had to use the folding technique bc Chinese Dynasties banned the export of weapon material including iron and Japans iron ores suck ass.