Helga Hufflepuff

From Hpwiki

Helga Hufflepuff, along with Godric Gryffindor, Rowena Ravenclaw and Salazar Slytherin was one of the founders of Hogwarts, and the founder of Hufflepuff house.

The Sorting Hat describes her as "sweet", and also says that she came from the valley. In her students she valued hard work, but she was willing to accept everyone and "treat them just the same".