Arruns Tarquinius was one of the sons of Lucius Tarquinius Superbus, the last King of Rome. Ancient sources differ as to whether he was the second or third son. In the earliest accounts, passed through fragments of the first Roman historian, Fabius Pictor, he is the third son. According to Livy and Dionysius of Halicarnassus, he is the second son. Modern historians doubt the historicity of the specific actions attributed to Arruns and other members of his dynasty, regarding them as highly embellished by later accounts.