September 9
Birth of son Honorius to Aelia Flacilla and Theodosius.
Honorius is elevated to consul by Theodosius I.
January 23
Theodosius raises his son Honorius to co-emperor.
January 17
Theodosius dies, leaving Arcadius as the Emperor of the Eastern Empire and Honorius as the Western Emperor.
Honorius marries Maria, the daughter of his general Stilicho.
Honorius moves his capital from Milan to Ravenna after the invasion of the Visigoths under Alaric I.
November
Alaric marches through the Alps and enters Italy to the despair of Honorius.
April 6
Stilicho, the general of Honorius, defeats Alaric at Pollentia.
Stilicho, general to Honorius, defeats an invasion by Radagaisus.
Death of the Empress Maria, wife of Honorius.
Constantine III proclaimed as Emperor in Britain over Honorius.
Constantine III invades Gaul and takes Arles from Honorius.
Alaric invades Italy and Stilicho, general to Honorius, forces the Senate to give Alaric 4000 pounds of gold to leave.
February
Stilicho marries his second daughter, Thermantia, to Honorius.
August 22
Honorius executes his general Stilicho after a number of setbacks.
Alaric surrounds Rome and forces the senate to elect Priscus Attalus as Emperor, who ratified the previous treaty with Stilicho. This is an obvious threat to Honorius.
Gerontius, a general under Constantine III, who was a usurper of Honorius, rebels against Constantine III and declares Maximus Emperor.
The Eastern Roman Empire sends Honorius 6,000 soldiers to relieve the siege of Rome, but Alaric ambushes them and few survive.
Alaric dethrones Priscus Attalus to renew negotiations with Honorius.
August 24
Rome under Honorius is sacked by the Visigoths under Alaric.
Constantius, general to Honorius, defeats his usurpers Gerontius, Maximus, and Constantine III.
Jovinus rebels against Honorius in Gaul and attempts to negotiate with the Goths.
Honorius convinces Atauf of the Goths to kill the usurper Jovinus.
Heraclianus raises a rebellion in Africa, then attempts to attack Honorius in Italy. The attack is repulsed and Heraclianus returns to Carthage, where he is killed.
Atauf of the Goths declares Priscus Attalus Emperor and is attacked by Constantius, general to Honorius, who deposes Priscus Attalus again.
The general Constantius marries Galla Placidia, the sister of Honorius, against her will.
Honorius signs a treaty that grants the Visigoths southwestern Gaul.
Honorius issues the Edict of 418, which relaxes administrative control over the provinces and allows Rome to hold them in name.
Honorius recognizes Constantius as co-emperor, but Theodosius in the east refuses to recognize him.
September
Constantius, now co-emperor with Honorius, prepares a campaign against Theodosius in the east, but dies before it departs.
August 15
Death of Honorius from edema. Johannes is nominated as Emperor.