"Small changes in initial conditions can drive long-term huge chain reactions of the entire system, and a small change can affect the development of things." We all know the butterfly effect - this butterfly effect occurred in Europe a thousand years ago - an era when the witch-hunting movement had not yet completely exploded.
Four young wizards came together by chance and established a wizard's school...
Godric Gryffindor, Roweno Ravenclaw (Rowena becomes Roweno) gender change setting.
CP: Salazar Slytherin x Godric Gryffindor♀
Purpose: Sexual transformation