High Quality Content by WIKIPEDIA articles! Servius Tullius was the legendary sixth king of ancient Rome, and the second of its Etruscan dynasty. He reigned 578-535 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 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.