Actually the katana and Korean swordsa are very similar the katana is probably from Korea. Koreans did use straight double edged swords as well but I gave him a katana.
Knight :
1. Abbr. Knt. or Kt. A medieval tenant giving military service as a mounted man-at-arms to a feudal landholder.
2. Abbr. Knt. or Kt. A medieval gentleman-soldier, usually high-born, raised by a sovereign to privileged military status after training as a page and squire.
3. Abbr. K. A man holding a nonhereditary title conferred by a sovereign in recognition of personal merit or service to the country.
Abbr. Knt. or Kt. A man belonging to an order or brotherhood.
1. A defender, champion, or zealous upholder of a cause or principle.
I think must fedual countries had knights, Japan samurai, Shilla hwarang. When my Korean friend comes online I'll ask her for a better name.
Korean Swords after 5min search on internet
most is from Choseon period after mongols. This knight is set around the time of Mongols.