Conversation so far:
what are the different houses of harry potter
Hogwarts was divided into four houses: Gryffindor, Hufflepuff, Ravenclaw, and Slytherin.
who founded each of the hogwarts houses
Gryffindor was founded by Godric Gryffindor, Hufflepuff was founded by Helga Hufflepuff, Ravenclaw was founded by Rowena Ravenclaw, and Slytherin was founded by Salazar Slytherin.

Question: who is salazar
Self-contained rewrite: who is salazar slytherin