The last emperor in the West belonging to the dynasty was Galla Placidia's son Valentinian III.

Descendants of the dynasty continued to be part of the East Roman nobility at Constantinople until the end of the 6th century.

[1] The epitome de Caesaribus places his birthplace at Cauca (Coca, Segovia) in Hispania.

[1] At the fall of his father, Theodosius the dux of Moesia Prima retired to his estates in the Iberian Peninsula, where he married Aelia Flaccilla in 376.

[1] On 27 February 380 Theodosius issued the Edict of Thessalonica, making Nicene Christianity the state church of the Roman Empire.

[1] According to the Consularia Constantinopolitana, Theodosius arrived at Constantinople and staged an adventus, a ritual entry to the capital, on 24 November 380.

[1] On 21 February 382, the body of Theodosius's father in law Valentinian the Great was finally laid to rest in the Church of the Holy Apostles.

[1] According to the Consularia Constantinopolitana, a treaty of foedus was reached with the Goths, and they were settled between the Danube and the Balkan Mountains.

[1] According to the Chronicon Paschale, Theodosius celebrated his quinquennalia on 19 January at Constantinople; on this occasion he raised his eldest son Arcadius to co-augustus.

[1] Early 383 saw the acclamation of Magnus Maximus as augustus in Britain and the appointment of Themistius as praefectus urbi in Constantinople.

[5] On the 25 August 383, according to the Consularia Constantinopolitana, Gratian was killed at Lugdunum (Lyon) by Andragathius, the magister equitum of the rebel augustus during the rebellion of Magnus Maximus (r. 383–388).

[4] Constantia's body arrived in Constantinople on 12 September that year and was buried in the Church of the Holy Apostles on 1 December.

[6][1] Theodosius brokered a peace agreement between Valentinian and Magnus Maximus which endured for several years.

[1] She died at Scotumis in Thrace and was buried at Constantinople, her funeral oration delivered by Gregory of Nyssa.

[1] The peace with Magnus Maximus was broken in 387, and Valentinian escaped the west with Justina, reaching Thessalonica (Thessaloniki) in summer or autumn 387 and appealing to Theodosius for aid; Valentinian II's sister Galla was then married to the eastern augustus at Thessalonica in late autumn.

[1] According to the Consularia Constantinopolitana, Arbogast killed Flavius Victor (r. 384–388), Magnus Maximus's young son and co-augustus, in Gaul in August/September that year.

[1] Theodosius came into conflict with Ambrose, bishop of Mediolanum, in October 388 over the persecution of Jews at Callincium-on-the-Euphrates (Raqqa).

[1] As mentioned in the Panegyrici Latini and in a panegyric of Claudian's on the sixth consulship of Honorius, Theodosius then received another embassy from the Persians in 389.

[7][6] In spring 390, possibly in April, the Massacre of Thessalonica was perpetrated by Theodosius's army, leading to a confrontation with Ambrose.

[1] In 391, a delegation from the Roman Senate was snubbed in Gaul because of the reappearance of the Altar of Victory in the Curia Julia.

[1] Eventually, he came to Constantinople, where according to Socrates Scholasticus's Historia Ecclesiastica he held an adventus, entering the city on 10 November 391.

[1] On 15 May 392, Valentinian II died at Vienna in Gaul (Vienne), either by suicide or as part of a plot by Arbogast.

[1] His funeral was held there on 25 February, and his body transferred to Constantinople, where according to the Chronicon Paschale he was buried on 8 November 395 in the Church of the Holy Apostles.

[1] The two surviving sons of Theodosius ruled the eastern and western halves of the empire after their father died.

[9] When Honorius died in 423, the primicerius notariorum Joannes (r. 423–425) succeeded as augustus in the west; thereafter Theodosius II (r. 402–450) – son and successor of Arcadius as augustus in the east – moved to install Galla Placidia's son Valentinian as emperor in the west instead, appointing him caesar on 23 October 424.

[9] After the fall of Joannes, Valentinian III was made augustus on the first anniversary of his investiture as caesar; he ruled the western provinces until his death on the 16 March 455, though Galla Placidia was regent during his youth.