40

Year 40 was a (link will display the full calendar) of the.

Roman Empire

 * The emperor is  without colleague.
 * Caligula embarks on a campaign to conquer, and fails miserably.
 * and are incorporated into the.
 * Caligula transforms the principate into a . He distributes honors carelessly, declares himself a god and orders that all the heads of the Greek statues be replaced by his. Lastly, he makes his horse a senator.

Europe

 * The German tribe begin settling in present-day  and.

Asia

 * becomes king of, opposed by his brother.
 * The ese rebel against the rule of the.

Arts and sciences

 * teaches that all men are born free.

Religion

 * comes to as a church is founded in .  founds the  as the first pope.
 * An early Christian church is erected at (most probable date).
 * The Jewish festival of (Passover) is adopted by the Christians and renamed.

Births

 * , general and military author
 * , Greek and
 * , daughter of and . (d. )
 * of the
 * , daughter of and . (d. )
 * of the

Deaths

 * January —, husband of , brother-in-law of
 * (executed by Caligula)