427

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Year 427 (CDXXVII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Hierius and Ardabur (or, less frequently, year 1180 Ab urbe condita). The denomination 427 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.

• Bonifacius, Roman governor (Last of the Romans), revolts in Africa against Emperor Valentinian III. Under the influence of Aetius, he is convicted of treason by empress-mother Galla Placidia.

• The Roman province of Pannonia Prima is finally assimilated into the Hunnic Empire.

• The Ephthalites (White Huns) invade Western Asia and reduce the Sasanian Empire threat to the Eastern Roman Empire. King Bahram V sends an expeditionary force into Khorasan.
• King Jangsu transfers the Goguryeo capital from Gungnae City (modern Ji'an, Jilin) on the banks of the Yalu River to Pyongyang (modern Korea).
• Biyu becomes king of the Korean kingdom of Baekje.^[1]

• Erbin of Dumnonia, Brythonic king (approximate date)
• Qi Gaodi, Chinese emperor of the Southern Qi Dynasty (d. 482)
• Wang Xianyuan, empress and wife of Song Xiaowudi (d. 464)

• December 24 – Sisinnius I, archbishop of Constantinople
• Guisin, king of Baekje (Korea)^[1]
• Tao Qian, Chinese poet of the Eastern Jin Dynasty (b. 365)