Cæsar did not delay a moment. Sending orders to his various legions distributed through Gaul to follow him as speedily as possible, he placed himself at the head of such forces as were with him at the instant, crossed the small stream called the Rubicon, which separated his province of Cisalpine Gaul from Italy, and advanced towards Rome, amid cheers of welcome from the populations which he passed through. Utterly bewildered by his unexpected arrival, the whole senatorial party, with Pompey at their head, abandoned Rome, and proceeded into the south of Italy, where they tried to raise forces. Cæsar pursued them, and drove them into Greece. Then hastening into Spain, he suppressed a rising Pompeian movement in that country. Returning to Rome with the title of Dictator, which had been bestowed on him during his absence, he passed various salutary measures for restoring order in Italy, and among them one conferring the Roman citizenship on the Cisalpine Gauls; then crossed over into Greece (B. C. 49) to give battle to Pompey, who had meanwhile assembled forces from all parts of the Roman dominion. At length the two armies met on the plain of Pharsalia in Thessaly (9th August B. C. 48), when Pompey sustained a complete defeat. Not long afterwards he was killed by the orders of Ptolemy, king of Egypt, when seeking to land on the coast of that country. Cæsar, who had used his victory with great moderation, arrived in Egypt soon after, and remained there several months, fascinated by Cleopatra, who was then at war with her brother Ptolemy. Having settled the affairs of Egypt, Cæsar proceeded to Asia Minor, crushed an insurrection there headed by Pharnaces, the son of Mithridates, and then (September, B. C. 47) returned to Italy. He remained there but a few months, setting out in the beginning of B. C. 46 for Africa, where the relics of the Pompeian party had taken refuge. These were soon defeated; and Cato, the most distinguished man among them, killed himself rather than to fall into his conqueror’s hands. Pompey’s two sons escaped to Spain, where they excited an insurrection, which, however, was soon suppressed. EXTINCTION OF THE COMMONWEALTH――DICTATORSHIP AND DEATH OF CÆSAR――THE SECOND TRIUMVIRATE――CIVIL WARS OF MARK ANTONY AND OCTAVIANUS.