Called the Lateran obelisk, this is the oldest in Rome. Originally erected by Thutmose IV at the Temple of Amun at Karnak in the 15th c. BC. Constantine had the obelisk moved as far as Alexandria where he abandoned it. His son, Constantius II brought to Rome from Alexandria in 357 to decorate the Circus Maximus. It was found there in 3 pieces in 1587. At 31 m high it is the tallest obelisk in existence