At the time of Hogwarts' creation, only a few rooms were reserved for each founder's students, but like many other features, each set of rooms eventually expanded and gathered into separate wings displaying trademark characteristics of each of their patrons.
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A History of Magic (by Bathilda Bagshot)
Ficción históricaThis took me a long time to find. This version is a little different than the rest of this same book.
British Magical History: The First Wizarding School: Common Rooms
At the time of Hogwarts' creation, only a few rooms were reserved for each founder's students, but like many other features, each set of rooms eventually expanded and gathered into separate wings displaying trademark characteristics of each of their patrons.