Anno Domini
About the Anno Domini
The Anno Domini system was devised in 525 in Rome by the monk Dionysius Exiguus for his Easter tables, counting years from his estimate of the Incarnation. Bede's Ecclesiastical History of about 731 popularised it, and Charlemagne's court spread it across Europe. There is no year zero: AD 1 follows 1 BC. CE and BCE are religiously neutral names for the same count.
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