His nephew Lucius Junius Brutus and his friend Lucius Tarquinius Collatinus led a revolt against him after his son, Sextus, supposedly raped Collatinus' wife Lucretia.  
He is said to have purchased three prophetic books from the Cumaean Sibyl and to have deposited them in the temple of Jupiter begun by his father.  His nephew Lucius Junius Brutus and his friend Lucius Tarquinius Collatinus led a revolt against him after his son, Sextus, supposedly raped Collatinus' wife Lucretia.  The son of Tarquinius Priscus and the son-in-law of Servius Tullius, FTP, identify this man overthrown in 509 BCE, the seventh and last king of Rome.
He is said to have purchased three prophetic books from the Cumaean Sibyl and to have deposited them in the temple of Jupiter begun by his father.  
Tarquin the Proud or Tarquinius Superbus