It's in Order.
1 - 4-6AD
Birth of Jesus
2 - 33 AD
Death and Resurrection of Jesus
3 - 33AD
Pentecost
4 - 49AD
Council of Jerusalem
5 - 60 AD
Martyrdom of SS. Peter and Paul
6 - 111AD
Pliny-Trajan Correspondence
7 - 203 AD
Martyrdom of Perpetua and Felicity
8 - 249AD
Persecution under Emperor Decius
9 - 303AD
Persecutions under Diocletian
10 - 313AD
Edict of Milan
11 - 325AD
Council of Nicaea
12 - 361AD
Reign of Julian the Apostate
13 - 380AD
Theodosius - Christianity state Religion
14 - 452AD
The meeting of Attila the Hun and Pope Leo the Great
15 - 476AD
The fall of Roman Empire (WEST)
16 - 590AD
Pope St. Gregory the Great