Mostow Natavel, a descendant of Ravenclaw, was a student of Slytherin. Madam Pomfrey once commented that her mother was the most Ravenclaw person she had ever seen, even if her daughter was a Slytherin.
After fourth grade, everything changed. Why is it different?
Note: The main plot of the heroine is in the fourth grade, so I won't write anything about the first to third grade. I may only mention it in one sentence. I wrote about the entrance because I think the look at the long table at the entrance is very touching!
Purpose: Save Sif!