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|417 by topic|
|Ab urbe condita||1170|
|Balinese saka calendar||338–339|
|Chinese calendar||丙辰年 (Fire Dragon)
3113 or 3053
— to —
丁巳年 (Fire Snake)
3114 or 3054
|- Vikram Samvat||473–474|
|- Shaka Samvat||338–339|
|- Kali Yuga||3517–3518|
|Iranian calendar||205 BP – 204 BP|
|Islamic calendar||211 BH – 210 BH|
|Minguo calendar||1495 before ROC
|Seleucid era||728/729 AG|
|Thai solar calendar||959–960|
543 or 162 or −610
— to —
544 or 163 or −609
|Wikimedia Commons has media related to 417.|
Year 417 (CDXVII) 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 Honorius and Constantius (or, less frequently, year 1170 Ab urbe condita). The denomination 417 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.
- January 1 – Emperor Honorius forces his half-sister Galla Placidia into marriage to Constantius, his general (magister militum). He is appointed patricius and becomes a prominent member of the House of Theodosius.
- The Visigoths are granted Aquitaine, and become allies (foederati) of the Western Roman Empire. King Wallia establishes his capital at Toulouse.
- January – Pope Innocent I condemns Pelagianism, and excommunicates the ascetic Pelagius.
- March 12 – Innocent I dies after a 16-year reign in which he has restored relations between the sees of Rome and Antioch, enforced celibacy of the clergy, and maintained the right of the bishop of Rome to judge appeals from other churches. Innocent is succeeded by Zosimus as the 41st pope.
- March 12 – Pope Innocent I
- Li Gao, Chinese general of the state Western Liang (b. 351)
- Yao Hong, last emperor of the Qiang state Later Qin (b. 388)