Livy: Ab Urbe Condita (History of Rome)
When a few days had gone by, Sextus Tarquinius, without letting Collatinus know, took a single attendant and went to Collatia. Being kindly welcomed, for no one suspected his purpose, he was brought after dinner to a guest-chamber. Burning with passion, he waited till it seemed to him that all about him was secure and everybody fast asleep; then, drawing his sword, he came to the sleeping Lucretia. Holding the woman down with his left hand on her breast, he said, “Be still, Lucretia! I am Sextus Tarquinius. My sword is in my hand. Utter a sound, and you die!” In affright the woman started out of her sleep. No help was in sight, but only imminent death. Then Tarquinius began to declare his love, to plead, to mingle threats with prayers, to bring every resource to bear upon her woman’s heart. When he found her obdurate and not to be moved even by fear of death, he went farther and threatened her with disgrace, saying that when she was dead he would kill his slave and lay him naked by her side, that she might be said to have been put to death in adultery with a man of base condition. At this dreadful prospect her resolute modesty was overcome, as if with force, by his victorious lust; and Tarquinius departed, exulting in his conquest of a woman’s honour. Lucretia, grieving at her great disaster, dispatched the same message to her father in Rome and to her husband at Ardea:  that they should each take a trusty friend and come; that they must do this and do it quickly, for a frightful thing had happened. Spurius Lucretius came with Publius Valerius, Volesus’ son. Collatinus brought Lucius Junius Brutus, with whom he chanced to be returning to Rome when he was met by the messenger from his wife. Lucretia they found sitting sadly in her chamber. The entrance of her friends brought the tears to her eyes, and to her husband’s question, “Is all well?” she replied, “Far from it; for what can be well with a woman when she has lost her honour? The print of a strange man, Collatinus, is in your bed. Yet my body only has been violated; my heart is guiltless, as death shall be my witness. But pledge your right hands and your words that the adulterer shall not go unpunished. Sextus Tarquinius is he that last night returned hostility for hospitality, and brought ruin on me, and on himself no less—if you are men—when he worked his pleasure with me.” They give their pledges, every man in turn. They seek to comfort her, sick at heart as she is, by diverting the blame from her who was forced to the doer of the wrong. They tell her it is the mind that sins, not the body; and that where purpose has been wanting there is no guilt. “It is for you to determine,” she answers, “what is due to him; for my own part, though I acquit myself of the sin, I do not absolve myself from punishment; nor in time to come shall ever unchaste woman live through the example of Lucretia.” Taking a knife which she had concealed beneath her dress, she plunged it into her heart, and sinking forward upon the wound, died as she fell. The wail for the dead was raised by her husband and her father. 
When the news of these events reached the camp, the king, in alarm at the unexpected danger, set out for Rome to put down the revolt. Brutus, who had perceived the king’s approach, made a circuit to avoid meeting him, and at almost the same moment, though by different roads, Brutus reached Ardea and Tarquinius Rome. Against Tarquinius the gates were closed and exile was pronounced. The liberator of the City was received with rejoicings in the camp, and the sons of the king were driven out of it. Two of them followed their father, and went into exile at Caere, in Etruria. Sextus Tarquinius departed for Gabii, as though it had been his own kingdom, and there the revengers of old quarrels, which he had brought upon himself by murder and rapine, slew him.
Lucius Tarquinius Superbus ruled for five and twenty years. The rule of the kings at Rome, from its foundation to its liberation, lasted two hundred and forty-four years. Two consuls were then chosen in the centuriate comitia, under the presidency of the Prefect of the City, in accordance with the commentaries of Servius Tullius.1 These were Lucius Junius Brutus and Lucius Tarquinius Collatinus.