Theodosius I ruled the eastern Roman Empire from AD 379 and briefly reunited east and west before his death in 395. He recovered from the Gothic crisis through war and settlement, defeated rival emperors in civil conflict and promoted Nicene Christianity through law and imperial patronage.
After troops massacred civilians at Thessalonica, Bishop Ambrose compelled a famous act of penance. Theodosius’s death left the empire divided between his young sons Arcadius and Honorius. Theodosius I was born in Coca and died in Milan.
Ian Hughes’ Stilicho became the leading general of the Western Empire after the death of Theodosius I and claimed responsibility for protecting the young Honorius. Nick Holmes’ The Fall of Rome follows Valens, Theodosius I, Stilicho, Honorius and Alaric through divided courts, military rivalries and repeated failures of negotiation. Further fictional perspectives on Theodosius I can be found in Georg Ebers’ Serapis, Adam Lofthouse’s Barbarian and the Throne, and Gordon Doherty’s Devotio. For broader historical treatment of Theodosius I, see Ian Hughes’ Imperial Brothers and Adrian Goldsworthy’s The Fall of the West.