So the senate determined, in cases of great danger, to call upon one of the consuls to appoint a single chief, who should be called “dictator,” or master of the people.  He had sovereign power (Imperium) both in the city and out of the city, and the fasces were always carried before him with the axes in them, as they had been before the king.  He could only be appointed for six months, but at the end of the time he had to give no account.  So that he was free to act according to his own judgment, having no colleague to interfere with him at the present, and no accusations to fear at a future time.  The dictator was general-in-chief, and he appointed a chief officer to command the knights under him, who was called “master of the horse.”

And now it appeared to be a fit time to appoint such a chief, to take the command of the army against the Latins.  So the first dictator was T. Lartius, and he made Spurius Cassius his master of the horse.  This was in the year B.C. 499, eight years after the expulsion of Tarquin.

But the Latins did not declare war for two years after.  Then the senate again ordered the consul to name a master of the people, or dictator; and he named Aul.  Postumius, who appointed T. AEbutius (one of the consuls of that year) to be his master of the horse.  So they led out the Roman army against the Latins, and they met at the Lake Regillus, in the land of the Tusculans.  King Tarquin and all his family were in the host of the Latins; and that day it was to be determined whether Rome should be again subject to the tyrant and whether or not she was to be chief of the Latin cities.

King Tarquin himself, old as he was, rode in front of the Latins in full armor; and when he descried the Roman dictator marshalling his men, he rode at him; but Postumius wounded him in the side, and he was rescued by the Latins.  Then also AEbutius, the master of the horse, and Oct.  Mamilius, the dictator of the Latins, charged one another, and AEbutius was pierced through the arm, and Mamilius wounded in the breast.  But the Latin chief, nothing daunted, returned to battle, followed by Titus, the king’s son, with his band of exiles.  These charged the Romans furiously, so that they gave way; but when M. Valerius, brother of the great Poplicola, saw this, he spurred his horse against Titus, and rode at him with spear in rest; and when Titus turned away and fled, Valerius rode furiously after him into the midst of the Latin host, and a certain Latin smote him in the side as he was riding past, so that he fell dead, and his horse galloped on without a rider.  So the band of exiles pressed still more fiercely upon the Romans, and they began to flee.