Of the first two of these libraries we have no information; but in the case of the third we are more fortunate. The Forum of Trajan (fig. 4) was excavated by order of Napoleon I., and the extent of its buildings, with their relation to one another, is therefore known with approximate accuracy. The Greek and Latin libraries stood to the right and left of the small court between the _Basilica Ulpia_ and the _Templum Divi Trajani_, the centre of which was marked by the existing Column. They were entered from this court, each through a portico of five inter-columniations. The rooms, measured internally, were about 60 feet long, by 45 feet broad. At this point I must mention, parenthetically, the library built by Hadrian at Athens. Pausanias records it in the following passage: Hadrian also built for the Athenians a temple of Hera and Panhellenian Zeus, and a sanctuary common to all the gods. But most splendid of all are one hundred columns; walls and colonnades alike are made of Phrygian marble. Here, too, is a building adorned with a gilded roof and alabaster and also with statues and paintings: books are stored in it. There is also a gymnasium named after Hadrian; it too has one hundred columns from the quarries of Libya[37]. A building called the Stoa of Hadrian, a ground-plan of which (fig. 5) I borrow from Miss Harrison's _Mythology and Monuments of Ancient Athens_, has been identified with part at least of that which Pausanias describes in the above passage. A lofty wall, built of large square blocks of Pentelic marble, faced on the west side by a row of Corinthian columns, enclosed a quadrangular court, measuring 328 feet from east to west, by 250 feet from north to south. This court, entered through a sort of propylaea on the west side (N), was surrounded by a cloister or colonnade 27 feet wide, and containing 100 columns. None of those columns are standing, but their number can be accurately calculated from the marks of the bases still to be seen on the eastern side of the quadrangle. Within this area are the remains of a building of uncertain use, and at present only partially excavated. On the east side a row of five chambers, of which that in the centre was the largest, opened off from the colonnade[38]. [Illustration: Fig. 5. Plan of the Stoa of Hadrian, at Athens. AE, KI. Pier-arcade of the medieval church of the Panagia. B. North-east angle of this church, of Roman work. B, C, D, F. Portions of the Roman building which preceded the church. L, M. Reservoirs. N. Propylaea through which the court was entered. ]