The
Spanish era,
Hispanic era or
Caesar era refers to the dating system used in
Hispania until the 14th century, when the
Anno Domini system was adopted. It began with year one in what is 38 BC, probably the date of a new tax imposed by the
Roman Republic on the subdued population of
Iberia. Whatever the case, the date signifies the beginning of the
Pax Romana in Hispania. To convert from a date in the
Christian era to the corresponding year in the Hispanic era, add 38 to the Christian era year. A date in the Hispanic era was written thus: "Era CMXLI" for "anno domini [AD] 903".