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AD 20 in various calendars
Gregorian calendar	AD 20; XX
Ab urbe condita	773
Assyrian calendar	4770
Balinese saka calendar	N/A
Bengali calendar	−573
Berber calendar	970
Buddhist calendar	564
Burmese calendar	−618
Byzantine calendar	5528–5529
Chinese calendar	己卯年 (Earth Rabbit); 2717 or 2510; — to —; 庚辰年 (Metal Dragon); 2718 or 2511
Coptic calendar	−264 – −263
Discordian calendar	1186
Ethiopian calendar	12–13
Hebrew calendar	3780–3781
Hindu calendars
- Vikram Samvat	76–77
- Shaka Samvat	N/A
- Kali Yuga	3120–3121
Holocene calendar	10020
Iranian calendar	602 BP – 601 BP
Islamic calendar	621 BH – 619 BH
Javanese calendar	N/A
Julian calendar	AD 20; XX
Korean calendar	2353
Minguo calendar	1892 before ROC; 民前1892年
Nanakshahi calendar	−1448
Seleucid era	331/332 AG
Thai solar calendar	562–563
Tibetan calendar	阴土兔年; (female Earth-Rabbit); 146 or −235 or −1007; — to —; 阳金龙年; (male Iron-Dragon); 147 or −234 or −1006

Millennium:	1st millennium
Centuries:	1st century BC; 1st century ; 2nd century;
Decades:	0s; 10s; 20s ; 30s; 40s;
Years:	17; 18; 19; AD 20 ; 21; 22; 23;

AD 20 (XX) was a leap year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcus Valerius Messalla Barbatus and Cotta (or, less frequently, year 773 Ab urbe condita). The denomination 20 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

Galba, the future emperor, is a Roman praetor.
Emperor Tiberius is forced to order an investigation and a public trial in the Roman Senate, for the murder of Germanicus. Fearing he will be found guilty, Gnaeus Calpurnius Piso commits suicide.^[1]

^ Robert K. Sherk, ed. (1984). Rome and the Greek East to the death of Augustus. Cambridge: Cambridge University Press. ISBN 0-521-24995-3. OCLC 9197359.
^ Török, László (1997). The kingdom of Kush : handbook of the Napatan-Meroitic civilization. Leiden: Brill. ISBN 90-04-10448-8. OCLC 36865663.