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Year 390 (CCCXC) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Neoterius (or, less frequently, year 1143 Ab urbe condita). The denomination 390 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||1143|
|Balinese saka calendar||311–312|
|Chinese calendar||己丑年 (Earth Ox)|
3086 or 3026
— to —
庚寅年 (Metal Tiger)
3087 or 3027
|- Vikram Samvat||446–447|
|- Shaka Samvat||311–312|
|- Kali Yuga||3490–3491|
|Iranian calendar||232 BP – 231 BP|
|Islamic calendar||239 BH – 238 BH|
|Minguo calendar||1522 before ROC|
|Seleucid era||701/702 AG|
|Thai solar calendar||932–933|
516 or 135 or −637
— to —
517 or 136 or −636
- April – Massacre of Thessalonica: Resentment among the citizens of Thessalonica (Macedonia), after the arrest of a popular charioteer, breaks out into violence. Butheric, military commander of Illyricum, is murdered. Emperor Theodosius I orders vengeance, despite the pleas of Ambrose, bishop of Milan, for mercy, and more than 7,000 inhabitants are massacred by the Roman army.
- Ambrose retires to Milan (residence of Theodosius I) and refuses to celebrate a mass in the emperor's presence, until he repents for ordering the massacre in Thessalonica. Theodosius, filled with remorse, kneels in humility and strips off his royal purple, before the altar of the cathedral in Milan, humbling himself before the church.
- The Visigoths and Huns, led by Alaric, invade Thrace. Stilicho, high-ranking general (magister militum) of Vandal origin, raises an army and begins a campaign against the Goths.
- Theodosius I brings an obelisk from Egypt to the Hippodrome of Constantinople.
- Rudrasena II becomes emperor of Vakataka in the Deccan Plateau (India). In the same year he marries Prabhavatigupta, daughter of the Gupta king Chandragupta II.
- C. 390–401 – Priestess of Bacchus: Late Antiquity ivory diptych; documents the relationship of the senators Quintus Aurelius Symmachus and Virius Nicomachus Flavianus. It commemorates the marriage of the two families. The right panel is inscribed "Symmachorum", with an elaborately dressed priestess who makes an offer on an altar. It is now kept at Victoria and Albert Museum in London.
- Bleda, king of the Huns (approximate date)
- Gao Yun, duke of the Xianbei state Northern Wei (d. 487)
- Prosper of Aquitaine, disciple and Christian writer (approximate date)
- Romanus of Condat, hermit and saint (approximate date)
- Simeon Stylites, Christian Stylite (approximate date)
- Xie Hui, general of the Liu Song Dynasty (d. 426)