The Study of Ancient Runes, commonly shortened to Ancient Runes, is an elective course at Hogwarts School of Witchcraft and Wizardry, that can be taken by students third year and above. It is the study of magical runic scriptures.
The bathroom was likely created with the rest of the school by Godric Gryffindor, Salazar Slytherin, Helga Hufflepuff and Rowena Ravenclaw in Medieval times on a sixth-floor corridor that would later be known as Glanmore Peakes' Corridor. At some point, the bathroom fell into disuse and was no longer used.
The East Wing is a large hall located on the sixth floor of Hogwarts Castle. There is a huge fireplace in the center of the room and some portraits hung on the walls. There are portraits of Damara Dodderidge, Termeritus Shanks and Eoessa Sakndenberg, among others in this room. There are various suits of armour, which guard the room after the sun is down.
A very quiet floor here; not much happens on the sixth floor, leaving the boys alone to strike up mischief in their wake. However, the Ancient Runes Professor is lurking not far away, so the plans are usually foiled. There is a the lowly east wing and a disused bathroom hiding in the midsts, though.