431

Year 431 was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Bassus (consul 431)|Bassus] and Antiochus. The denomination 431 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

Aetius campaign in the Alps: Flavius Aetius, Roman general, fights the rebellion in Rhaetia and Noricum. He is attested in the city of Vindelicia, reestablishing Roman rule on the Danube frontier.
Aetius pushes the Salian Franks back across the River Somme. King Chlodio signs a peace treaty and becomes a foederatus of the Western Roman Empire.

Hippo Regius becomes the capital of the Vandal Kingdom. After 14 months of hunger and disease, the Vandals ravage the city. Emperor Theodosius II sends an imperial fleet with an army under command of Aspar, and lands at Carthage.
Aspar is routed by the Vandals and Flavius Marcian, future List of [Byzantine emperors|Byzantine emperor], is captured during the fighting. He negotiates a peace with King Genseric and maintains imperial authority in Carthage.

March 10 - Kʼukʼ [Bahlam I], the first known ruler of the Mayan city-state of Palenque comes to power and reigns until his death four years later.
Possible date of the Tierra Blanca Joven eruption of the Ilopango caldera in central El Salvador.

Greek Neoplatonist philosopher Proclus begins studying at the Academy in Athens.

June - First Council of Ephesus: Nestorianism is rejected; the Nicene Creed is declared to be complete. Nestorius is deposed from his see.
October 1 - Maximianus of Constantinople|Maximianus] is enthroned as Patriarch of Constantinople.
Pope Celestine I dispatches Palladius to serve as bishop to the Irish.