Servius Tullius was the legendary sixth king of Rome, and the second of its Etruscan dynasty. He reigned 575–535 BC. Roman and Greek sources describe his servile origins and later marriage to a daughter of Lucius Tarquinius Priscus, Rome's first Etruscan king, who was assassinated in 579 BC. Servius was variously said to have been the first Roman king to accede without election by the Senate, having gained the throne by popular support, at the contrivance of his mother-in-law; and the first to be elected by the Senate without reference to the people.