Originally from Heliopolis. Brought to Rome by Augustus in 10 BC with the Flaminio obelisk to form the gnomon of a sundial on the Campus Martius. Found in 16th century but reburied. Rediscovered and erected by Pope Pius VI in front of the Palazzo Montecitorio in 1792.
Height (with base) 21.79 m (33.97 m)