Note 298 — PHOTIUS BIBLIOTHECA OR MYRIOBIBLON[6] (continued 2)
John Henry Freese translation
A period of 15 years, instituted by Constantine the Great in 313 for fiscal purposes, afterwards adopted as a convenient method of chronology generally. To find the year of the indiction, add 3 to any date of our era, divide by 15, and the remainder is the indiction, or if there is no remainder, the indiction is 15.