The subject and the ancient sources
The imperial crisis and the Illyrian emperors
The First Tetrarchy and the Caesar's son
The Gallic emperor and the dying persecutors
The Italian campaign and Constantine's conversion
Religious concerns and apostolic Rome
The Eastern Crusade and the Nicene Council
The dynastic tragedy and Helena's pilgrimage
Imperial concerns and Christian Constantinople
The final campaigns and the emperor's heirs
The thirteenth apostle and the Christian empire
The legacy and modern interpretations.