Sandor Clegane, also referred to as 'the Hound' is a knight in the famous series of Game of Thrones. His first depicted duty was a member of Kings Guard, or to protect the King from any harm. Sandor Clegane's main duty was with the King, Joeffrey at the time, but he left the red keep. He later resigned himself because he thought that fighting someone else's war while the main person whom it matters sits on a safe place would be worthless and honor-less to him. Sandor Clegane has a scar of fire in his head. His head was burned by his brother because he was playing with one of his brother's toy. Now his only aim remains to kill Gregor Clegane, his own brother-- as revenge. It can be seen that his burned face always makes him remember about his evil brother. To recapitulate, Sandor Clegane was a great knight whose only aim remains to kill Gregor Clegane, his own brother, as depicted by the series so far.