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Year 434 (CDXXXIV) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Aspar and Areobindus (or, less frequently, year 1187 Ab urbe condita). The denomination 434 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.
|Ab urbe condita||1187|
|Balinese saka calendar||355–356|
|Chinese calendar||癸酉年 (Water Rooster)|
3130 or 3070
— to —
甲戌年 (Wood Dog)
3131 or 3071
|- Vikram Samvat||490–491|
|- Shaka Samvat||355–356|
|- Kali Yuga||3534–3535|
|Iranian calendar||188 BP – 187 BP|
|Islamic calendar||194 BH – 193 BH|
|Minguo calendar||1478 before ROC|
|Seleucid era||745/746 AG|
|Thai solar calendar||976–977|
560 or 179 or −593
— to —
561 or 180 or −592
- Flavius Aetius, Roman general (magister militum) in the service of Emperor Valentinian III, begins to hold power in Rome (this will continue for 20 years). He allows the Huns to settle in Pannonia, along the Sava River.
- Justa Grata Honoria, older sister of Valentinian, becomes pregnant from an officer in her household. Circles in the court at Ravenna assume inevitably that Honoria is planning to raise her paramour to imperial rank and challenge her brother. Valentinian then has him executed.
- Summer – The Huns under Rugila devastate Thrace and move steadily towards Constantinople. The citizens prepare themselves for a long siege, depending on the strength of the Theodosian Walls.
- Emperor Theodosius II bribes the Huns (after the death of Rugila) to keep the peace in the Eastern Roman Empire.
- The Vandals in North Africa defeat the Roman general Aspar and force him to withdraw. He serves as consul at Constantinople.
- Attila, king of the Huns, consolidates his power in the Hungarian capital, probably on the site of Buda (modern Budapest). He jointly rules the kingdom with his brother Bleda.
- Theodosian Empresses: Woman and Imperial Dominion in Late Antiquity, by Kenneth G. Holum
- The End of Empire (p. 90). Christopher Kelly, 2009. ISBN 978-0-393-33849-2
- Chadwick, Henry (2001). The Church in Ancient Society: From Galilee to Gregory the Great. Oxford University Press. p. 547. ISBN 9780199246953.