Centuries: 1st century BC - 1st century - 2nd century
Decades: 10s BC 0s BC 0s 10s 20s - 30s - 40s 50s 60s 70s 80s
Years: 34 35 36 37 38 - 39 - 40 41 42 43 44
- Tigellinus, minister and favorite of the later Roman emperor Nero, is banished for adultery with Caligula's sisters.
- Domitius Afer secures a consulship.
- Caligula is also a consul.
- Agrippa I, king of Judea, is recalled to Rome.
- Legio XV Primigeneia and Legio XXII Primigeneia are levied by Caligula for the German frontier.
- The Trung Sisters resist the Chinese influences in Vietnam.
- November 3 - Lucan, Roman poet
- December 30 - Titus Flavius, Roman emperor (79-81)
- Britannicus, son of Roman emperor Claudius and his third wife Messalina.
- Seneca the Elder, Roman rhetorician
For the number 39, see thirty-nine.