Titus Livius (Livy), The History of Rome, Book 1
Benjamin Oliver Foster, Ph.D., Ed.

6. At the beginning of the fray Numitor exclaimed that an enemy had invaded the city and attacked the palace, and drew off the active men of the place to serve as an armed garrison for the defence of the citadel; and when he saw the young men approaching, after they had dispatched the king, to congratulate him, he at once summoned a council, and laid before it his brother's crimes against himself, the parentage of his grandsons, and how they had been born, reared, and recognised. [2] He then announced the tyrant's death, and declared himself to be responsible for it. The brothers advanced with their band through the midst of the crowd, and hailed their grandfather king, whereupon such a shout of assent arose from the entire throng as confirmed the new monarch's title and authority.

[3] [p. 25] The Alban state being thus made over to Numitor, Romulus and Remus were seized with the desire to found a city in the region where they had been exposed and brought up. And in fact the population of Albans and Latins was too large; besides, there were the shepherds. All together, their numbers might easily lead men to hope that Alba would be small, and Lavinium small, compared with the city which they should build. [4] These considerations were interrupted by the curse of their grandsires, the greed of kingly power, and by a shameful quarrel which grew out of it, upon an occasion innocent enough. Since the brothers were twins, and respect for their age could not determine between them, it was agreed that the gods who had those places in their protection should choose by augury who should give the new city its name, who should govern it when built. Romulus took the Palatine for his augural quarter, Remus the Aventine.