# 20s

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Third decade of the first century AD

For the 20S proteasome, see [Proteasome § 20S core particle](/source/Proteasome#20S_core_particle).

This article is about the years AD 20–29. For the years 20–29 in other centuries, see [List of decades](/source/List_of_decades).

Not to be confused with [1820s](/source/1820s), [1920s](/source/1920s), or [2020s](/source/2020s).

Remains of the [Castra Praetoria](/source/Castra_Praetoria), built in 23 AD by [Lucius Aelius Sejanus](/source/Sejanus)

Millennia 1st millennium Centuries 1st century BC 1st century 2nd century Decades 0s 10s 20s 30s 40s Years AD 20 AD 21 AD 22 AD 23 AD 24 AD 25 AD 26 AD 27 AD 28 AD 29 Categories Births Deaths Establishments Disestablishments v t e

The **20s** decade ran from January 1, AD 20, to December 31, AD 29.

In Europe, the 20s saw revolts by the [Aedui](/source/Aedui), [Thracian](/source/Thracians) tribesmen, and the [Frisians](/source/Frisians) against the [Roman Empire](/source/Roman_Empire). In [North Africa](/source/North_Africa), [Tacfarinas](/source/Tacfarinas), a Numidian Berber deserter, led the [Musulamii](/source/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](/source/Xin_dynasty) collapsed and the [Eastern Han](/source/Eastern_han) dynasty was established. In Korea, [Daemusin of Goguryeo](/source/Daemusin_of_Goguryeo) annexed [Dongbuyeo](/source/Dongbuyeo) and killed its king [Daeso](/source/Daeso).

In science, the 20s saw the manufacture of [pens](/source/Pen) and metal writing tools in Rome. Major disasters of this decade include a fire in [Rome](/source/Rome), and the collapse of a poorly built [amphitheatre](/source/Amphitheatre) in [Fidenae](/source/Fidenae), which killed 20,000 of the 50,000 spectators. In 27, [Christianity](/source/Christianity) originates from [Judaea](/source/Roman_Judaea) as a [Jewish Christian sect](/source/Jewish_Christians) of the [Second Temple Judaism](/source/Second_Temple_Judaism). *[Geographica](/source/Geographica)*, an encyclopedia of geographical knowledge created by [Strabo](/source/Strabo), was finished no later than AD 23.

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

## Demographics

Main article: [Estimates of historical world population](/source/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[1] to 300[2] 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.[3]

## Events

### AD 20

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 20](/source/AD_20). ([edit](https://en.wikipedia.org/w/index.php?title=AD_20&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_20&action=history))

### AD 21

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 21](/source/AD_21). ([edit](https://en.wikipedia.org/w/index.php?title=AD_21&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_21&action=history))

### AD 22

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 22](/source/AD_22). ([edit](https://en.wikipedia.org/w/index.php?title=AD_22&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_22&action=history))

### AD 23

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 23](/source/AD_23). ([edit](https://en.wikipedia.org/w/index.php?title=AD_23&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_23&action=history))

### AD 24

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 24](/source/AD_24). ([edit](https://en.wikipedia.org/w/index.php?title=AD_24&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_24&action=history))

### AD 25

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 25](/source/AD_25). ([edit](https://en.wikipedia.org/w/index.php?title=AD_25&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_25&action=history))

### AD 26

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 26](/source/AD_26). ([edit](https://en.wikipedia.org/w/index.php?title=AD_26&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_26&action=history))

### AD 27

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 27](/source/AD_27). ([edit](https://en.wikipedia.org/w/index.php?title=AD_27&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_27&action=history))

### AD 28

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 28](/source/AD_28). ([edit](https://en.wikipedia.org/w/index.php?title=AD_28&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_28&action=history))

### AD 29

This section is [transcluded](https://en.wikipedia.org/wiki/Help:Transclusion) from [AD 29](/source/AD_29). ([edit](https://en.wikipedia.org/w/index.php?title=AD_29&action=edit) | [history](https://en.wikipedia.org/w/index.php?title=AD_29&action=history))

## Significant people

- [Tiberius](/source/Tiberius), [Roman Emperor](/source/Roman_Emperor) ([AD 14](/source/AD_14)–[37](/source/AD_37))

## Births

Transcluding articles: 20s, 20s, 20s, 20s, 20s, 20s, 20s, 20s, 20s, and 20s

## Deaths

Transcluding articles: 20s, 20s, 20s, 20s, 20s, 20s, 20s, 20s, 20s, and 20s

## References

1. **[^](#cite_ref-thesocialcontract.com_1-0)** [John H. Tanton, 1994, "End of the Migration Epoch? Time For a New Paradigm", The Social Contract, Vol. 4 (no 3), pp. 162–173](http://www.thesocialcontract.com/artman2/publish/tsc0403/article_329.shtml).

1. **[^](#cite_ref-2)** 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."

1. **[^](#cite_ref-3)** Manning, Scott (2008-01-12). ["Year-by-Year World Population Estimates: 10,000 B.C. to 2007 A.D."](https://scottmanning.com/content/year-by-year-world-population-estimates/) *Historian on the Warpath*. Retrieved 2023-03-05.

## External links

- Media related to [20s](https://commons.wikimedia.org/wiki/Category:20s) at Wikimedia Commons

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Adapted from the Wikipedia article [20s](https://en.wikipedia.org/wiki/20s) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/20s?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.