Note 403 — Chapter VI · REPAIRS ON THE THEODOSIAN WALLS.
Reading edition
Ibid., pp. 634, 635. The tax was called “dikeraton,” because it was equal to two keratia (1s. ½d.), or one-twelfth of a nomisma (12s. 6d.). Cf. Finlay, History of the Byzantine Empire, i. pp. 37, 38.