Ruddy Man, also known as the Father of the Dreugh, was the Dreugh that Vivec fought inside the Koal Cave. The cave is located near the town of Gnisis, in Vvardenfell. Vivec was victorious, but spared Ruddy Man's life on the promise that Ruddy Man and his children were to give up their hides to serve as armor for the Dunmer. Ten years after their battle at Koal Cave, Vivec and the Ruddy Man fought once again outside the city of Tear.
During the events of The Elder Scrolls III: Morrowind, a shrine known as the The Shrine of Valor can be found inside Koal Cave. The shrine commemorates the battle and the agreement that Vivec and the Ruddy Man had.