The Lateran Obelisk is the tallest obelisk in Rome, and the largest standing ancient Egyptian obelisk in the world, weighing 455 tons. Originally from the temple of Amun in Karnak, the obelisk was first brought to Alexandria over the Nile in the early 4th century along with the Obelisk of Theodosius by Constantius II. He intended to bring them both to Constantinople, his new capital for the Roman empire. The obelisk never made it there.