Spanish era
calendar era used in the Iberian peninsula
The Spanish era or Hispanic era (Latin: Æra Hispanica), sometimes called the era of Caesar, was a calendar era (year numbering system) commonly used in the states of the Iberian Peninsula from the 5th century until the 15th, when it was phased out in favour of the Anno Domini (AD) system. The epoch (start date) of the Spanish era was 1 January 38 BC. To convert an Anno Domini date to the corresponding year in the Spanish era, add 38 to the Anno Domini year, such that Era 941 would be equivalent to AD 903. A date given in the Spanish era always uses the word era followed by a feminine ordinal number (when written out instead of given in Roman numerals). This contrasts with the AD system that uses the masculine anno (year): i.e., era millesima octava versus anno millesimo octavo.
The reasons behind the choice of 38 BC are unknown. It has been suggested that it may result from an Easter table that began with that year (rather than the Incarnation). Isidore of Seville in his Etymologiae (early 7th century) included an explanation of the meaning of Latin aera, plural of aes (bronze, brass, copper). "An era", writes Isidore, "according to the sequence of the years was set up by Caesar Augustus when he first levied a general tax and mapped the Roman world [i.e., in 38 BC]. It was called aera because the whole world pledged itself to deliver copper to the state." In reality, the meaning of "period of time" for aera comes from the use of bronze counters in calculations.
The Spanish era was used throughout the Visigothic Kingdom, which covered all of the Iberian Peninsula and the region of Septimania.
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