31

This page is about the year 31. For the actual number, see thirty-one.

Millennium:	1st millennium
Centuries:	1st century BC – 1st century – 2nd century
Decades:	0s  10s  20s  – 30s –  40s  50s  60s
Years:	28 29 30 – 31 – 32 33 34

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31 (XXXI) was a common year starting on Monday of the Julian calendar, the 31st year of the Common Era (CE) and Anno Domini (AD) designations, the 31st year of the 1st millennium, the 31st year of the 1st century, and the 2nd year of the 30s decade. As of the start of 31, the Gregorian calendar was 2 days behind the Julian calendar, which was the dominant calendar of the time.

Events

• Aelius Sejanus named co-Consul to the Emperor Tiberius. Tiberius has Sejanus arrested for treachery and executed.
• April 6 - possible crucifixion of Jesus
• Naevius Sutorius Macro becomes the leader of the Praetorian Guard
• Tiberius returns to Rome from Capri

Births

• Musonius Rufus, Roman philosopher

Deaths

• October 18 - Aelius Sejanus, Roman politician
• Marcus Velleius Paterculus, Roman historian
• Livilla, niece and daughter-in-law of the emperor Tiberius
• Saint Stephen