Such were the chief improvements of the city during the kingly rule. Under the consuls the growth was constant, but was not marked by grand edifices. Portunus, the conqueror of the Tarquins at Lake Regillus, erected a temple to Ceres, Liber, and Libera, at the western extremity of the Circus Maximus. Camillus founded a celebrated temple to Juno on the Aventine. But these, and a few other temples, were destroyed when the Gauls held possession of the city. The city was rebuilt hastily and without much regard to regularity. There was nothing memorable in its architectural monuments till the time of Appius Claudius, who constructed the Via Appia, the first Roman aqueduct. In fact the constant wars of the Romans prevented much improvement in the city till the fall of Tarentum, although the ambassadors of Pyrrhus were struck with its grandeur. M. Curius Dentatus commenced the aqueduct called Anio Vetus B.C. 278, the greater part of which was under ground. Its total length was forty-three miles. Q. Flaminius, B.C. 220, between the first and second Punic wars, constructed the great highway, called after him the Via Flaminia--the great northern road of Italy, as the Via Appia was the southern. These roads were very elaborately built. In constructing them, the earth was excavated till a solid foundation was obtained; over this a layer of loose stones was laid, then another layer nine inches thick of rubble-work of broken stones cemented with lime, then another layer of broken pottery cemented in like manner, over which was a pavement of large polygonal blocks of hard stone nicely fitted together. Roads thus constructed were exceedingly durable, so that portions of them, constructed two thousand years ago, are still in a high state of preservation. [Sidenote: Ancient basilicas.] [Sidenote: Temple of Hercules.]