The Tempio della Tosse which probably obtains its name from a vulgar interpretation of the name of the gens Tossia, is a ruin standing in a vineyard at the side of the old road, called the Via Constantina, below the Villa d’Este. It has none of the characteristic marks of an ancient temple, and the large number of windows it contains forbid us to suppose it to be a tomb. The interior of the building is round, the exterior octagonal. It is built of layers of small fragments of tufa intermixed with courses of bricks, materials which point to the fourth century as the earliest possible date of its erection. On the walls are the remains of frescoes of the Saviour and the Virgin, dating probably from the 13th century. These show that, if it was not originally a Christian Church, it was used as one at the time the frescoes were painted. [Sidenote: Villa of Cassius.] The ruins of a considerable villa lie near the Porta S. Croce of Tivoli, in the estate called Carciano, from the mediæval name of the Fundus Cassianus, which is stated in a list of the estates belonging to the cathedral at Tivoli to have been the site of a villa of Caius Cassius. Part of these ruins consist of a very ancient structure of polygonal work, but the rest is pronounced by Nibby to belong to the time of the later republic. The casino of the Collegio Greco is now built on the spot, but the plan of the ancient villa can be so far traced as to show that it had several terraces, and looked towards the south-west. In the 16th century there were still eighteen large apartments existing, surrounded with a portico of Doric columns, and also some temples, a theatre, some fountains, and fish ponds. The opus reticulatum of these ruins is peculiar for the alternate arrangement of coloured tufa in its lozenges. An immense number of works of art were dug up here, and the nearly complete destruction of what still remained of the villa in the 16th century, is probably due to the fact of its having been found to be so rich a mine of sculpture. [Sidenote: Sabine Farm of Horace.]