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|409 by topic|
|Ab urbe condita||1162|
|Balinese saka calendar||330–331|
|Chinese calendar||戊申年 (Earth Monkey)|
3105 or 3045
— to —
己酉年 (Earth Rooster)
3106 or 3046
|- Vikram Samvat||465–466|
|- Shaka Samvat||330–331|
|- Kali Yuga||3509–3510|
|Iranian calendar||213 BP – 212 BP|
|Islamic calendar||220 BH – 219 BH|
|Minguo calendar||1503 before ROC|
|Seleucid era||720/721 AG|
|Thai solar calendar||951–952|
535 or 154 or −618
— to —
536 or 155 or −617
Year 409 (CDIX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Honorius and Theodosius (or, less frequently, year 1162 Ab urbe condita). The denomination 409 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.
- Spring – Gerontius, Roman general (magister militum), who had been a partisan of Constantine III, revolts in Hispania. He elevates Maximus, his domesticus, as emperor.
- October 13 – The Vandals, led by king Gunderic, cross the Pyrenees into the Iberian Peninsula. They receive land from the Romans, as foederati, in Baetica (Southern Spain). The Alans occupy lands in Lusitania and the Suebi control parts of Gallaecia.
- The Visigothic king Alaric I lays siege to Rome a second time, bringing the inhabitants close to starvation. Emperor Honorius, safe in inaccessible Ravenna, refuses to negotiate for peace, despite repeated offers from Alaric, who then comes to terms with the Senate and sets up a rival emperor, Priscus Attalus, prefect (praefectus urbi) of the city.
- Honorius agrees that sons of prominent families at court in Ravenna be sent beyond the Danube as hostages; in return, later he calls up ten thousand Hun mercenaries.
- Famine strikes Hispania, Gaul and the Italian Peninsula.
- Mingyuan, age 17, succeeds Daowu as emperor of the Chinese Northern Wei (one of the Northern dynasties).
- Daniel the Stylite, Christian saint (approximate date)
- Liu Yikang, prince of the Liu Song Dynasty (d. 451)
- Gao Yun, emperor of the Northern Yan
- Li of Yan, empress, wife of Gao Yun (who died the same year)
- Mallius Theodorus, Roman consul (approximate date)
- Serena, noblewoman and wife of Stilicho
- Daowu, emperor of the Northern Wei (b. 371)