E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Duumvirs (3 syl.)
or Duumv&icheck;r. Certain Roman officers who were appointed in pairs, like our London sheriffs. The chief were the two officers who had charge of the Sibylline books, the two who had the supervision of the municipal cities, and the two who were charged with naval matters.