The Third Raikage (三代目雷影, Sandaime Raikage; Literally meaning "Third Lightning Shadow") was the leader of Kumogakure thirty years prior to the Fourth Shinobi World War.
The Third wounds himself.
The Third's rule was punctuated by the berserk attacks of the Eight-Tails but as Kumogakure couldn't afford to dispose of such a valuable war deterrent, he was forced to look for a suitable jinchūriki in quick succession, after the conclusion of each rampage. During one of these attacks, the Third fought the Eight-Tails alone, allowing his comrades to escape. Their battle resulted in the Raikage receiving a self-inflicted wound to the chest after he collapsed upon his own hand, which became his life's shame. Since this event, he made it a personal duty to combat the Eight-Tails whenever its jinchūriki lost control, with even his son eventually becoming part of the group that supported him during these occurrences. He chose to seal the Eight-Tails in the Kohaku no Jōhei, resulting in his nephew's death, hoping that someone else would have more success in controlling it.