Fuguki Suikazan

Background
The unnamed previous owner of the Samehada was a high-ranking shinobi of Kirigakure, and the superior of Kisame Hoshigaki. He, like Kisame, had shark-like attributes, but is more round in size. He ordered Kisame to protect his comrades, but more importantly, codes that are important to their village, which led Kisame to massacre his own teammates to protect such information.

Later, this superior was revealed to be leaking information to the enemy, and was killed by Kisame when he let his guard down against his subordinate. Thus, Samehada's ownership was transferred to Kisame.