He brought architects from Etruria to plan the temple, but he forced the Roman people to work for him without hire.

One day a strange woman appeared before the king and offered him nine books to buy; and when he refused them she went away and burned, three of the nine books and brought back the remaining six and offered to sell them at the same price that she had asked for the nine; and when he laughed at her and again refused, she went as before and burned three more books, and came back and asked still the same price for the three that were left.  Then the king was struck by her pertinacity, and he consulted his augurs what this might be; and they bade him by all means buy the three, and said he had done wrong not to buy the nine, for these were the books of the Sibyl and contained great secrets.  So the books were kept underground in the Capitol in a stone chest, and two men (duumviri) were appointed to take charge of them, and consult them when the state was in danger.

The only Latin town that defied Tarquin’s power was Gabii; and Sextus, the king’s youngest son, promised to win this place also for his father.  So he fled from Rome and presented himself at Gabii; and there he made complaints of his father’s tyranny and prayed for protection.  The Gabians believed him, and took him into their city, and they trusted him, so that in time he was made commander of their army.  Now his father suffered him to conquer in many small battles, and the Gabians trusted him more and more.  Then he sent privately to his father, and asked what he should do to make the Gabians submit.  Then King Tarquin gave no answer to the messenger, but, as he walked up and down his garden, he kept cutting off the heads of the tallest poppies with his staff.  At last the messenger was tired, and went back to Sextus and told him what had passed.  But Sextus understood what his father meant, and he began to accuse falsely all the chief men, and some of them he put to death and some he banished.  So at last the city of Gabii was left defenceless, and Sextus delivered it up to his father.

While Tarquin was building his temple on the Capitol, a strange portent offered itself; for a snake came forth and devoured the sacrifices on the altar.  The king, not content with the interpretation of his Etruscan soothsayers, sent persons to consult the famous oracle of the Greeks at Delphi, and the persons he sent were his own sons Titus and Aruns, and his sister’s son, L. Junius, a young man who, to avoid his uncle’s jealousy, feigned to be without common sense, wherefore he was called Brutus or the Dullard.  The answer given by the oracle was that the chief power of Rome should belong to him of the three who should first kiss his mother; and the two sons of King Tarquin agreed to draw lots which of them should do this as soon as they returned home.  But Brutus perceived that the oracle had another sense; so as soon as they landed in Italy he fell down on the ground as if he had stumbled, and kissed the earth, for she (he thought) was the true mother of all mortal things.