The Apostolic period of the Church lasted from around 29 AD to 100 AD. This period is called Apostolic because the original Apostles were alive and preaching during this time. Some key events included the birth of the Church at Pentecost, Paul's missionary journeys spreading Christianity throughout the Mediterranean, and the martyrdom of many early Christians including Stephen, Peter, and Paul. The last Apostle, John, died around 100 AD, marking the end of the Apostolic period.