Suetonius,
The Lives of the Twelve Caesars…
“ Neither consanguinity nor adoption, as formerly, but great influence in the army having now become the road to the imperial throne, no person could claim a better title to that elevation than Titus Flavius Vespasian. He had not only served with great reputation in the wars both in Britain and Judaea, but seemed as yet untainted with any vice which could pervert his conduct in the civil administration of the empire. ”
