447

Year 447 was a common year starting on Wednesday of the Julian calendar. At the time, it was known in the Roman Empire as the Year of the Consulship of Calepius and Ardabur. The denomination 447 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

November 6 - The Walls of Constantinople are severely damaged by an earthquake, which destroys large parts of the structure, including 57 towers. The population is threatened by a plague. Emperor Theodosius II orders Constantine, praetorian prefect of the East, to supervise the repairs. He employs the city's demoi in the work, and rebuilds the walls within 60 days.
The Huns, led by Attila, cross the Danube, and invade the Balkans as far as Thermopylae. During the invasion, Serdica is destroyed. For disobeying the terms of the treaty made in 442, Attila triples his demand for tribute to 2,100 pounds of gold per year; and the ransom for each Roman prisoner to 12 solidi.
Theodosius II sends an embassy to Attila; Priscus of Panium, envoy for the Eastern Roman Empire. Priscus records one of the few eyewitness accounts of the Hun kingdom.
Battle of the Utus: Attila defeats the Roman army near the river Utus. The Huns are forced to abandon the siege of Constantinople. They march north and plunder the defenseless Balkan provinces.
Winter - Theodosius II chooses a policy to protect Constantinople against the Huns. He removes Aspar and Areobindus from their military commands.
Europe
Vortigern, king of the Britons, receives the Saxon leaders Hengist and Horsa "as friends" and grants the brothers the Isle of Thanet, most easterly point of Kent.
By topic

The first entry in the Annales Cambriæ refers to this year.
Religion
Germanus, bishop of Auxerre, makes his second visit to Britain.
The Synod of Toledo tries to add the filioque clause to the Nicene Creed. The Eastern Orthodox Church refuses to go along with this idea.