CYCLE of Indiction, a period of fifteen years, in use among the Romans. It has no connection with the celestial motions, but was instituted, according to Baronius, by Constantine, who, having reduced the time which the Romans were obliged to serve to fifteen years, was consequently obliged every fifteen years to impose (indicere, according to the Latin expression) an extraordinary tax for the payment of those who were discharged. And hence arose this cycle, which, from the Latin word indicere, was styled indiction.