 In any case, his efforts were of no avail to the exiled Roman king.Tarquin's final attempt to regain the Roman kingdom came in 498 or 496 BC, when he persuaded his son-in-law, Octavius Mamilius, dictator of Tusculum, to march on Rome at the head of a Latin army.The Roman army was led by the dictator, Albus Postumius Albus, and his Master of the Horse, Titus Aebutius Elva, while the elderly king and his last remaining son, Titus Tarquinius, accompanied by a force of Roman exiles, fought alongside the Latins.