- Notes: Sometimes the '40s is used as shorthand for the 1940s, the 1840s, or other such decades in various centuries. In American vernacular, '40s' may also refer to forty ounce bottles of malt liquor.
Events and Trends
- Gaius Caesar Germanicus/Caligula (37–41).
- Claudius, Roman Emperor (41–54).
- Paul of Tarsus, Christian evangelist
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