The greatest of the Hogwarts Four

In a thousand years of existence, the Sorting Hat has been on many heads. He's heard the thoughts of thousands children. He's seen it all, heard it all. But this? That spark in the boy's soul? Golden and bright and so, so warm? There's been only one man who had it. For centuries, the Sorting Hat's always sought him. And now, Hogwarts' greatest founder was back.