Passing from Ostia along the sea coast through the woods of Castel Fusano to Torre Paterno, we find the ruins of a large villa, which have been supposed by some to belong to Pliny’s Laurentinum. But they are more probably the relics of an imperial villa mentioned by Herodian as the retreat to which Commodus withdrew, by the advice of his physicians, at the time of the great plague in Rome, in the year 187. The neighbourhood of Laurentum was recommended, says the historian, on account of its being cooler than Rome, and also because it was shaded with large woods of laurel and bay trees, the strong scent from which was supposed to counteract the influence of the deadly malaria which was devastating the capital.[155] The present ruins at Torre Paterno consist of brick walls in two styles, one of which Nibby refers to the age of Nero, and the other to the reign of Commodus or Severus. The central building, which contained the grand suite of rooms, is the only part where work of the first century, analogous to that of Nero’s buildings at Rome, is to be seen; the rest, says Nibby, is composed of various courtyards in the style of the Antonine era, which have been altered and partly concealed by later modern edifices. On one side of the ruins are two large cisterns, supplied by an aqueduct which comes from the Tenimento la Santola. The brickwork of this is apparently contemporaneous with other works which we know to have belonged to the age of Commodus or Severus as having very thin bricks and a great quantity of mortar. Near these reservoirs is an enclosed space which was probably a courtyard or garden of a rectangular shape. On the north side it has some ruins in the mode of construction called opus mixtum of the fourth century; and on the east is the principal part of the villa built of large and thick triangular bricks, with thin layers of mortar beautifully laid, and evidently of an early date. On the west there is a large dining-hall looking towards the sea, like that described in Pliny’s Laurentinum. Various other rooms and the foundations of a tower can be traced on the sites occupied by the modern guardhouse and the Chapel of S. Filippo.[156] (E) TIBUR.