The AD system of dating was first invented by a [[Roman Catholic]] monk named [[Dionysus]] in Italy in the 6th century AD. Unfortunately, his computations met with a problem. [[Herod the Great]] died in 4 BC, and the census of Judea took place when that province was annexed by Rome in AD 6. Presumably, Dionysus compromised and chose a year about halfway between these to start his calendar with. Either way, it is incorrect in a strict historical sense. Previously, people in Europe measured time from the accession of the Emperor [[Diocletian]] in AD 284, or from the founding of the city of Rome in 753 BC, or simply by naming the annually elected [[consul]]s.
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The Anglo-Saxon historian [[Bede]] was one of the first scholars to use the AD system around 700 AD, in his book [[The Ecclesiastical History of the English People]].
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The Anglo-Saxon historian [[Bede]] was one of the first scholars to use the AD system, in his book [[The Ecclesiastical History of the English People]].