He is the daimyō of the Land of Lightning.

During a meeting of the Five Great Shinobi Countries' daimyō, he agreed to the creation of the Allied Shinobi Forces. In the anime, he was requested to convene a Daimyō Summit by the Fourth Raikage.

Manga Debut: Chapter #488
Anime Debut: Naruto Shippūden Episode #217

(source: Narutopedia)