Before the era of ninja villages, the Mizuno clan was once a part of the Hyuga clan. Though after several years of mistreatment from those of the Hyuga who possessed the Byakugan, those without the "eyes" revolted against the higher members of the clan, staring a civil war. Since those events, the clan has separated into several parts. Many clan members currently reside near the ocean or other water-based ninja villages such as Takigakure. However, a larger part of the clan resides within Konohagakure in order to keep watch over the Hyuga clan and their activities.