Alignn said: Why, is it a reference to a famous painting of him?
Google "本朝武優鏡".
...Truly a model servant of peerless loyalty.A servant of the lady Yuyuko Saigyouji of Hakugyokurou. Half ghost and half human, she is not a normal girl. Usually she works as a gardener in the manor, but should a knave invade the place, she will draw two peculiarly sharp swords and dextrously bisect the intruder. Moreover, if her master acts foolishly, Youmu will admonish her without hesitation...Youmu Konpaku