FORUM TRAIANI, an ancient town of Sardinia, on the river Thyrsus (Tirso), and a station on the Roman road through the centre of the island from Carales to Olbia and Turris Libisonis. The best preserved of its ruins are the baths, erected over hot mineral springs. The tanks for collecting the water and the large central piscina are noteworthy. The bridge over the Tirso has been to some extent modernized. On the opposite bank near the old church of S. Lussorio, who is said to have been beheaded here (see PISA), are the scanty remains of an amphitheatre. Not far off is a group of nuraghi, of which that of S. Barbara in the commune of Villanova Truscheddu is one of the finest.