Kaiza (カイザ) was a traveling fisherman, who came to the Land of Waves to seek opportunities. When he saved Inari from drowning, he took up the young boy to teach him about life and protect the things that were precious to him. He married Tsunami (Inari's mother) and acted as the role model for Inari. When Gatō tried to take over the Land of Waves, Kaiza tried to stop his business. Gatō used him as an example to people who had hoped to stand against him, by having his goons cut off his arms and killing him.

(Source: Narutopedia)