Editing 20s

{{short description|Third decade of the first century AD}}
{{for|the 20S proteasome|Proteasome#20S core particle}}
{{About|the years AD 20–29|the years 20–29 in other centuries|List of decades}}
{{distinguish|1820s|1920s|2020s}}
[[File:Porta Praetoria 29 09 2019.jpg|thumb|250px|Remains of the [[Castra Praetoria]], built in 23 AD by [[Sejanus|Lucius Aelius Sejanus]]]]
{{Decadebox|2}}
The '''20s''' decade ran from January 1, AD 20, to December 31, AD 29.

In Europe, the 20s saw revolts by the [[Aedui]], [[Thracians|Thracian]] tribesmen, and the [[Frisians]] against the [[Roman Empire]]. In [[North Africa]], [[Tacfarinas]], a Numidian Berber deserter, led the [[Musulamii]] tribe and a loose and changing coalition of other Berber tribes in revolt, before being defeated in AD 24. In China, the [[Xin dynasty]] collapsed and the [[Eastern han|Eastern Han]] dynasty was established. In Korea, [[Daemusin of Goguryeo]] annexed [[Dongbuyeo]] and killed its king [[Daeso]].

In science, the 20s saw the manufacture of [[Pen|pens]] and metal writing tools in Rome. Major disasters of this decade include a fire in [[Rome]], and the collapse of a poorly built [[amphitheatre]] in [[Fidenae]], which killed 20,000 of the 50,000 spectators. In 27, [[Christianity]] was born as a [[Jewish sects|Jewish sect]] in [[Jerusalem]]. ''[[Geographica]]'', an encyclopedia of geographical knowledge created by [[Strabo]], was finished no later than AD 23.

Manning (2008) tentatively estimates the world population in AD 20 as 246 million.

== Demographics ==
{{Main|Estimates of historical world population}}
Due to lack of reliable demographic data, estimates of the world population in the 1st century vary wildly, with estimates for AD 1 varying from 150<ref name="thesocialcontract.com">[http://www.thesocialcontract.com/artman2/publish/tsc0403/article_329.shtml John H. Tanton, 1994, "End of the Migration Epoch?  Time For a New Paradigm", The Social Contract, Vol. 4 (no 3), pp. 162–173].</ref> to 300<ref>Haub (1995): "By 1 A.D., the world may have held about 300 million people. One estimate of the population of the Roman Empire, from Spain to Asia Minor, in 14 A.D. is 45 million. However, other historians set the figure twice as high, suggesting how imprecise population estimates of early historical periods can be."</ref> million. Demographers typically do not attempt to estimate most specific years in antiquity, instead giving approximate numbers for round years such as AD 1 or AD 200. However, attempts at reconstructing the world population in more specific years have been made, with Manning (2008) tentatively estimating the world population in AD 20 as 246 million.<ref>{{Cite web |last=Manning |first=Scott |date=2008-01-12 |title=Year-by-Year World Population Estimates: 10,000 B.C. to 2007 A.D. |url=https://scottmanning.com/content/year-by-year-world-population-estimates/ |access-date=2023-03-05 |website=Historian on the Warpath |language=en-US}}</ref>{{Events by year for decade|2}}

==Significant people==
* [[Tiberius]], [[Roman Emperor]] ([[AD 14]]–[[AD 37|37]])

{{Births and deaths by year for decade|2}}
==References==
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{{DEFAULTSORT:20s}}
[[Category:20s| ]]