chirizuka ubame

Stage 1 Boss of Fossilized Wonders, and 'king' of the yamanba (mountain hags) like Sakata Nemuno.

As it's implied that the yamanba have a heirarchy based on age, this implies Chirizuka is the oldest among them as well. With that said, yamanba by definition don't like the idea of making a society, so she rarely uses her power as 'king'.