408: taken captive by the Visigoths of king Alaric
410: Visigoths sack Rome; death of Alaric, who is succeeded by Athaulf
414: princess Galla Placidia is forced to marry king Athaulf
415: death of their new-born son Theodosius, and his father
416: Visigoths and Romans conclude a treaty; Galla Placidia, now widow, returns to the imperial court
417: Her half-brother, the emperor Honorius, marries her to general commander Constantius, who is recognized as emperor (Constantius III) in 421. Galla Placidia is called Augusta. Constantius soon dies
423: Galla Placidia is exiled to Rome, but she and her young son Valentinian move to Constantinople; Valentinian engaged to Eudoxia III (daughter of Theodosius II); death of Honorius, usurpation of Johannes; Theodosius II immediately recognizes Valentinian as emperor in the west
425: Johannes killed by East-Roman troops; he is succeeded by Valentinian as emperor, but Galla Placidia is the real ruler in the western half of the Roman empire
