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Years: ( 0Year Zero also refers to the Cambodian genocide of 1975 79. There is no year 0 in either the Gregorian calendar or the Julian calendar. The year 1 BC immediately precedes AD 1. Historians adopted this convention after it was first used by Bede in his Hist - does not exist in either the proleptic Gregorian calendar or Julian calendarThe Julian calendar was introduced by Julius Caesar in 46 BC, taking force in 45 BC or 709 ab urbe condita''. It was chosen after consultation with the Alexandrian astronomer Sosigenes and was probably designed to approximate the tropical year, known sinc, whether designated AD/BC or CE/BCE) 1For other uses, see One (disambiguation), for the number, see Number 1. Centuries: 1st century BC 1st century 2nd century Decades: 40s BC 30s BC 20s BC 10s BC 0s BC 0s 10s 20s 30s 40s 50s Years: 5 BC 4 BC 3 BC 2 BC 1 BC 1 2 3 4 5 6 (Year 0 does not exist) 2For other uses, see Number 2''. Centuries: 1st century BC 1st century 2nd century Decades: 40s BC 30s BC 20s BC 10s BC 0s BC 0s 10s 20s 30s 40s 50s Years: 4 BC 3 BC 2 BC 1 BC 1 2 3 4 5 6 7 Events Gaius Caesar meets with the king of Parthia on the Euphrate 3Centuries: 1st century BC 1st century 2nd century Decades: 40s BC 30s BC 20s BC 10s BC 0s BC 0s 10s 20s 30s 40s 50s Years: 3 BC 2 BC 1 BC 1 2 3 4 5 6 7 8 Events Lucius Aelius Lamia, is consul of Rome Births Paul of Tarsus Deaths 3. 4Centuries: 1st century BC 1st century 2nd century Decades: 40s BC 30s BC 20s BC 10s BC 0s BC 0s 10s 20s 30s 40s 50s Years: 2 BC 1 BC 1 2 3 4 5 6 7 8 9 Events Rome: Emperor Caesar Augustus summons Tiberius to Rome, and names him his heir and future emperor 5For the character in the comic strip Peanuts, see 5 (Peanuts Centuries: 1st century BC 1st century 2nd century Decades: 40s BC 30s BC 20s BC 10s BC 0s BC 0s 10s 20s 30s 40s 50s Years: 1 BC 1 2 3 4 5 6 7 8 9 10 Events Rome acknowledges Cymbeline, King of t 6 7 8 9