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| Millennium: | 1st millennium |
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| Centuries: | 1st century BC – 1st century – 2nd century |
| Decades: | 0s BC 0s 10s – 20s – 30s 40s 50s |
| Years: | 17 18 19 – 20 – 21 22 23 |
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20 is a year in the 1st century. It 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. view more...
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