The customs-duty levied by the Romans upon imports and exports; it was introduced as early
as the time of the kings, and was generally leased to publicani
In B.C. 60 it was abolished for Italy, but was re-introduced by Caesar for foreign goods, and
after that time always continued to exist. Free and allied cities were, in earlier times,
allowed to levy the customs for their own territory, but from these Romans were to be exempt.
Under the emperors customs were levied not only at the frontier of the Empire, but also at the
frontiers of the several provinces or of combinations of provinces united in one
excise-district. The percentage on the purchasing price of articles was different in different
districts. Besides this, export duties were levied on corn, oil, wine, salt, iron, and gold.