First Hoshikage

The was the founder of Hoshigakure two hundred years before the start of the series.

Background
Once he discovered a "fallen star" (a meteor) with mystical powers, he founded the Land of Bears, in hopes to make well-renowned shinobi and gain the title of a great hidden village. Unfortunately, he didn't know of the side effects of the star training, and people started to die from overpowering chakra that imploded in their bodies.