BOOK XX.--A colony settled at Spoletum. [Y.R. 512. B.C. 240.] An army sent against the Ligurians; being the first war with that state. The Sardinians and Corsicans rebel, and are subdued. [Y.R. 514. B.C. 238.] Tuccia, a vestal, found guilty of incest. War declared against the Illyrians, who had slain an ambassador; they are subdued and brought to submission. [Y.R. 515. B.C. 237.] The number of praetors increased to four. The Transalpine Gauls make an irruption into Italy: are conquered and put to the sword. [Y.R. 516. B.C. 236.] The Roman army, in conjunction with the Latins, is said to have amounted to no less than three hundred thousand men. [Y.R. 517. B.C. 235.] The Roman army for the first time crosses the Po; fights with and subdues the Insubrian Gauls. [Y.R. 530. B.C. 222.] Claudius Marcellus, consul, having slain Viridomarus, the general of the Insubrian Gauls, carries off the _spolia opima_. [Y.R. 531. B.C. 221.] The Istrians subdued; also the Illyrians, who had rebelled. [Y.R. 532. B.C. 220.] The censors hold a lustrum, in which the number of the citizens is found to be two hundred and seventy thousand two hundred and thirteen. The sons of freed-men formed into four tribes; the Esquiline, Palatine, Suburran, and Colline. [Y.R. 533. B.C. 219.] Caius Flaminius, censor, constructs the Flaminian road, and builds the Flaminian circus. BOOK XXI. _Origin of the second Punic war. Hannibal's character. In violation of a treaty, he passes the Iberus. Besieges Saguntum, and at length takes it. The Romans send ambassadors to Carthage; declare war. Hannibal crosses the Pyrenees: makes his way through Gaul; then crosses the Alps; defeats the Romans at the Ticinus. The Romans again defeated at the Trebia. Cneius Cornelius Scipio defeats the Carthaginians in Spain, and takes Hanno, their general, prisoner._