33Centuries: 1st century BC - 1st century - 2nd century
- Eastern Orthodox Church and/or Roman Catholicism and/or Christianity in general was founded on the Day of Pentecost (traditional date)
- Galba is a Roman Consul
- Saint Peter became Pope (according to Roman Catholicism tradition)
- Agrippina the Elder, wife of Germanicus (suicide by starvation)
- Good Friday - Jesus Christ, founder of Christianity (born about 1 BC) - crucified - traditional date (others estimate 30)
For the number 33, see thirty-three.