This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "448" – news · newspapers · books · scholar · JSTOR (October 2017) (Learn how and when to remove this message)

Year 448 (CDXLVIII) was a leap year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Praetextatus and Zeno (or, less frequently, year 1201 Ab urbe condita). The denomination 448 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.

• Emperor Theodosius II sends an embassy to Attila the Hun; Anatolius, an Eastern Roman general (magister militum) responsible for the security of the Eastern frontier, achieves a peace treaty with the Huns, in exchange for an annual tribute of 950 kilograms (2,100 lb) of gold per year.
• Attila demands in the treaty the evacuation of the territory running from Singidunum (Belgrade, in Serbia) 500 kilometres (300 mi) east along the Danube to Novae (Svishtov, in Bulgaria). This depopulated buffer zone deprives the Romans of their natural defensive advantages.^[1]
• Theodosius II orders all non-Christian books burned.

• Flavius Aetius suppresses the Bagaudae in Armorica (Gaul), and defeats the Salian Franks under King Chlodio near Arras (Belgica Secunda); the invaders are stopped around a river-crossing near Vicus Helena.
• Rechiar succeeds his father Rechila as king of the Suebi in Galicia (Northern Spain). He marries a daughter of the Visigoth king Theodoric I and converts to Catholicism.

• 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.

• Eutyches is accused of heresy at a synod held in Constantinople.

• Cyriacus of Athens, Greek anchorite and saint (d. 557)

• Kou Qianzhi, Chinese high official and Daoist (b. 365)
• Rechila, king of the Suebi^[2]
• Saint Germanus, bishop of Auxerre (approximate date)