Rowena Ravenclaw is one of the four founders of Hogwarts. It gave its name to one of the four houses of the school. She was the most brilliant witch of her time but she was heartbroken by her daughter, Helena, who stole her diadem, which contributed to her early disappearance.
Rowena Ravdaigle is best known for her intelligence and creativity. The concept of Hogwarts Castle changing position all the time is attributed to him. It is likely that it was she who proposed the changing rooms, such as the Room on Demand.