Note 44 — Chapter I

The portico of the Pantheon is now supported by sixteen monoliths of granite nearly 40 ft. high. Seven of these in the foremost row are of grey granite, the eighth (that at the north-east angle) and all those behind are of red granite. The present portico is a reconstruction by Hadrian in octostyle form of the original decastyle portico built by Agrippa. Agrippa’s portico had columns of a grey granite called ‘granito del foro,’ because it is the same kind that is used for the columns of the Forum of Trajan (Basilica Ulpia). This according to Corsi, Delle Pietre Antiche, Roma, 1845, is Egyptian from Syene, the Lapis Psaronius of Pliny, and Professor Lanciani, who has kindly written in reply to our question on the subject, endorses this opinion, though Jervis, see above, thinks the grey Pantheon columns are Elban. When Hadrian reconstructed the portico, he added columns of red granite, which are admitted by all to be Egyptian. The two columns at the east of the present portico were brought in in the year 1666 to fill gaps caused by the fall of the two Hadrianic ones. They came from the Baths of Nero and were found near S. Luigi dei Francesi. See postea, p. 128 f.