公由 喜一郎

The chief of Hinamizawa village, head of the Kimiyoshi House and the grandfather of Kimiyoshi Ichiho. 

His status as village chief is more like a symbolic title, since the Sonozaki House, lead by Sonozaki Oryou, are the true power in Hinamizawa. He also seemingly led the anti-dam movement during the Hinamizawa Dam Conflict, when Oryou was actually in control behind the scenes.

Higurashi Wiki