Emperor Yūryaku
An episode recorded in the "Shoki" concerning Emperor Yūryaku relates that the emperor, wishing to see the physical form of the god of Mount Miwa with his own eyes, commanded a retainer named Chiisakobe no Sugaru (少子部蜾蠃) to fetch the deity. Sugaru went up the mountain and captured a large snake, which he presented to the emperor. However, as Yūryaku neglected to ritually purify himself beforehand, the serpent made thunderous noise (or summoned thunder) and its eyeballs flashed. The emperor fled for fear of the snake and ordered it to be returned to Mount Miwa. He then gave the mountain (or Sugaru) the name 'Ikazuchi' (雷), meaning "thunder."