Chaturanga, Indian war game and an ancestor of chess through the Persian game of Shatranj (or Chatrang), evolves in the Indus Valley on the Indian subcontinent (approximate date).
August 18 – Pope Sixtus III dies after an 8-year reign in which he has resisted heresy and sponsored major construction programs in Rome. He is succeeded by Leo I as the 45th pope.
Winter – Leo I sends a letter to Valentinian III stating, "by the Holy Spirit's inspiration the emperor needs no human instruction and is incapable of doctrinal error".
The Huns, led by Attila, attack Constanţa (modern Romania), one of the few remaining Roman forts on the northern bank of the Danube, and designated as a secure trading post. On a crowded market day, the Huns take the town by surprise and slaughter the garrison.[2]
Valentinian III forms a marriage proposal for his eldest daughter Eudocia and Genseric's son Huneric. He is already married to a Visigoth princess, and Genseric decides to free him of his obligations by accusing her of trying to poison him. He leaves her mutilated - her ears and nose are cut off - and sends her back to her father Theodoric I, in Toulouse (Gaul).[citation needed]
Period of civil war and famine in Britain, caused by rival kingdoms and Pictish invasions; the situation aggravates tensions between Pelagian and Roman factions. Pro-Roman citizens migrate towards Gaul.
Emperor Valentinian III issues an imperial edict against Manichaeism. Heavy penalties are decreed against those who do not denounce the religion, and retain Manichaean books.[4]
Bleda, co-ruler of the Huns, dies in a hunting accident.[6] He is possibly murdered at the instigation of his younger brother Attila, with whom he has ruled since 434. Now about 39, Attila takes the throne for himself, and becomes king of the Hunnic Empire.
Bishop Germanus of Auxerre visits Ravenna, seeking to soften imperial hostility towards the Bagaudae. On his arrival at the capital, empress-mother Galla Placidia sends him a silver dish with a choice selection of prepared dainties—all vegetarian, out of respect for the bishop's strict diet. Germanus petitions the Senate for leniency for the citizens of Armorica (Brittany).[7]
The Huns, led by Attila, cross the Danube, and invade the Balkans as far as Thermopylae (Greece). During the invasion, Serdica (modern Sofia) is destroyed. For disobeying the terms of the treaty made in 442, Attila triples his demand for tribute to 2,100 pounds (ca. 700 kg) of gold per year; and the ransom for each Roman prisoner to 12 solidi.
Winter – Theodosius II chooses a policy to protect Constantinople against the Huns. He removes Aspar and Areobindus (magister militum) from their military commands.[8]
Kou Qianzhi, Chinese Daoist reformer, dies after having converted emperor Taiwu of Northern Wei and having established Daoism as the country's dominant religion. His death presages a revival of Buddhism as China's dominant faith.