Indiction
The Roman indiction - Latin indictio , “announces” -, corresponds to one 15 years period.
The reform of the imposition in the Roman Empire led to the beginning of the 3rd century organized a taxable amount according to the possessions and the incomes of the taxpayers. The tax statement of these taxable amounts was to be updated periodically. After a test according to one 5 years period, the periodicity at 15 years was adopted for this actualization, carried out under the responsibility of the offices of the Préfet of the court.
From 312, the emperor Constantin I {{er}} made compulsory the mention of the year of the indiction, i.e. the sequence number of the year in the cycle, so that a legal document is valid, creating a referencing of the dates more practical than the indication of the name of the Consul S of the year.
Charlemagne will take again this mode of dating from 800.
See too
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