The upper floor is dedicated to the three monarchs who contributed most to the foundation of the temple and the academy: Lư Thánh Tông (1023–1072), who founded the temple in 1070, Lư Nhân Tông (1066–1127), who founded the Imperial Academy, and Lê Thánh Tông (1442–1497), who ordered the erection of the turtle stone stelae of doctor laureates in 1484. On either side of the rear building are square buildings which hold a drum and a bronze bell. The drum is 2.01 metres wide, 2.65 metres high, has a volume of 10 m3 and weighs 700 kilogram. The bell was cast in 2000. It has a height of 2.1 metres and it is 0.99 metres wide. http://en.wikipedia.org/wiki/Temple_of_Literature,_Hanoi