He is the daimyo of the Land of Lightning.
During a meeting of the Five Great Shinobi Countries' daimyo, he agreed to the creation of the Allied Shinobi Forces. In the anime, he was requested to convene a Daimyo Summit by the Fourth Raikage.
Manga Debut: Chapter #488
Anime Debut: Naruto Shippuden Episode #217
(source: Narutopedia)