Abstract
There has always, apparently, been a strangely persistent belief among scholars in the existence of Knights of Senatorial rank, and though the definition of these has varied from time to time, their existence seems to be universally accepted.The first form of this idea is to be found in the view that the phrase ‘equitesillustres’ used by Tacitus refers to Knights possessing Senatorial rank. In a recent article the writer has dealt with this question, and tried to show how Mommsen definitely disposed of this theory. But in spite of his masterly refutation of it, it has found acceptance among more recent scholars, such as Furneaux, Pelham, Cagnat, and others.