Gegenhuber Griesela

Lord Gegenhuber Griesela (グリーセラ卿ゲーゲンヒューバー Guri-sera kyou ge-genhyu-ba-?) is Gwendal's cousin from his father's side. Years ago, Hube's bigotry and ambition led to many deaths forcing Gwendal to banish Hube from the Demon Kingdom under the guise of searching for a lost artifact, the Great Demon Flute. Twenty years later, Yuri learns of Hube in Conansia Svelera (Suberera) from the human woman, Nicola, who is bearing Hube's child. Yuri struggles to learn details about Hube's past but no one wants to talk about the acts that were so terrible, even Conrad is content to watch him die.[43] Hube becomes the bodyguard for a corrupt lord who swindles people into gambling and taking their shop deeds. When Yuri eventually discovers the truth, he forgave Hube for unintentionally trying to kill him, and begs Gwendel not to kill Hube. Gwendal eventually agrees not to, and Hube leaves for his own castle, but not before he tells Gwendal about a box he saw in Suberera.[21] The incident left Hube without his left eye, indicating this box was one of the Four Forbidden Boxes.
In the anime, Hube swore loyalty to Yuri because Yuri chose spare his life despite Hube's crime. As such, Hube would go to extreme lengths to protect Yuri, such as leaving Nicola to fight against the possessed Original King.

Source: Wikipedia