Tarquin the Proud (d. 496 B.C.)

Or Tarquinius Superbus, the Last King of Rome

Tarquinius-Superbus.jpg
Tarquinius Superbus [Published by Guillaume Rouille(1518?-1589); From "Promptuarii Iconum Insigniorum"] > Early Kings of Rome. PD Courtesy of Wikipedia

Lucius Tarquinius Superbus or Tarquin the Proud, who ruled from 534-510 B.C., was the last king the Romans would tolerate. One of the Etruscan kings of Rome, Tarquin the Proud was the son or grandson of Tarquinius Priscus and son-in-law of Servius Tullius, whom he is thought to have murdered. Tarquin's despotic reign earned him the title superbus (proud, haughty); however, it was Tarquin the Proud's son, Tarquinius Sextus, who raped Lucretia, the wife of his cousin, another Tarquin, Tarquinius Collatinus.

As a result of a revolt headed by Tarquin the Proud's nephew Lucius Junius Brutus and Tarquinius Collatinus, Tarquin the Proud and his family (ironically, including Collatinus) were expelled from Rome.

Along with the end of the Etruscan kings of Rome, the power of the Etruscans over Latium weakened. Rome replaced the Etruscan rulers with a Republic. Although there are some who believe there was a gradual transition to the two consul system of the Republic, the Fasti Consulares list the annual consuls straightaway from the end of the regal period.
Also see

Twelve Tablets
Abduction of Verginia
Tarquinius Priscus
Haruspicy
Livy on the death of Tullius