Yamato Takeru
The legendary origin of Kusatsu goes back to the second century during the Yayoi period. According to the legend, either Yamato Takeru or Yamabushi discovered the hot springs around Kusatsu; however, there is no historical evidence for either claim. Per legend, Yamato Takeru named Tsumagoi and Agatsuma after his wife ("tsuma" means "wife" in Japanese).