400

This article is about the year 400. For the number, see 400 (number). For other uses, see 400 (disambiguation).

Millennium:	1st millennium
Centuries:	3rd century 4th century 5th century
Decades:	380s 390s 400s 410s 420s
Years:	397 398 399 400 401 402 403

400 in various calendars

Gregorian calendar	400 CD
Ab urbe condita	1153
Assyrian calendar	5150
Balinese saka calendar	321–322
Bengali calendar	−193
Berber calendar	1350
Buddhist calendar	944
Burmese calendar	−238
Byzantine calendar	5908–5909
Chinese calendar	己亥年 (Earth Pig) 3097 or 2890     — to — 庚子年 (Metal Rat) 3098 or 2891
Coptic calendar	116–117
Discordian calendar	1566
Ethiopian calendar	392–393
Hebrew calendar	4160–4161
Hindu calendars
- Vikram Samvat	456–457
- Shaka Samvat	321–322
- Kali Yuga	3500–3501
Holocene calendar	10400
Iranian calendar	222 BP – 221 BP
Islamic calendar	229 BH – 228 BH
Javanese calendar	283–284
Julian calendar	400 CD
Korean calendar	2733
Minguo calendar	1512 before ROC 民前1512年
Nanakshahi calendar	−1068
Seleucid era	711/712 AG
Thai solar calendar	942–943
Tibetan calendar	阴土猪年 (female Earth-Pig) 526 or 145 or −627     — to — 阳金鼠年 (male Iron-Rat) 527 or 146 or −626

The Eastern Hemisphere in 400

Europe in 400

Year 400 (CD) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Stilicho and Aurelianus (or, less frequently, year 1153 Ab urbe condita). The denomination 400 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.

Events

By place

Roman Empire

• January 9 – Emperor Arcadius gives his wife Aelia Eudoxia the official title of Augusta. She is able to wear the purple paludamentum and is depicted in Roman currency.
• Anthemius, praetorian prefect of the East, is sent on an embassy to the Persian capital, Ctesiphon, to congratulate King Yazdegerd I on his accession the year before.
• A riot breaks out in Constantinople; the Great Palace is burned to the ground. Gainas, a Gothic leader, attempts to evacuate his soldiers out of the city, but 7,000 armed Goths are trapped and killed by order of Arcadius. After the massacre, Gainas tries to escape across the Hellespont, but his rag-tag ad hoc fleet is destroyed by Fravitta, a Gothic chieftain in imperial service.
• Winter – Gainas leads the remaining Goths back to their homeland across the Danube. They meet the Huns and are defeated; the Hunnic chieftain Uldin sends the head of Gainas to Constantinople, where Arcadius receives it as a diplomatic gift.

Europe

• The Paeonians (Illyricum) lose their identity (approximate date).

Asia

• Richū, the eldest son of Nintoku, becomes the 17th Emperor of Japan.

By topic

Art

• Resurrection and "Two Marys with Angel near the Empty Tomb", panel of a diptych, found in Rome, is made. It is now kept at Castello Sforzesco, Milan (approximate date).

Literature

• The Vergilius Vaticanus, an illuminated manuscript containing fragments of Virgil's Aeneid and Georgics, is made in Rome.
• The Yoga Sutras of Patanjali are composed.

Medicine

• Caelius Aurelianus, Roman physician, is practising his work "De morbis acutis et chronicis" (Concerning Acute and Chronic Illness), a guide to acute and chronic diseases.

Physics

• Hypatia, Greek philosopher, distinguishes herself as one of the first female scientists, and becoming head of the Neo-Platonist school at Alexandria.

Religion

• The mausoleum of Galerius in Salonica (Greece) is converted into a church.
• Bishops from Gaza (Palestine) arrive at Constantinople to ask Arcadius that he close the pagan temple of Marnas.

Births

• Aspar, Alan patrician and general (magister militum) (approximate date)
• Bahram V, Sasanian King of Kings (shahanshah)
• Hassan Yuha'min, king of the Himyarite Kingdom
• Hydatius, bishop of Aquae Flaviae (modern Chaves, Portugal) (approximate date)
• Pope Leo I, Bishop of Rome
• Qusayy ibn Kilab, Ishmaelite descendant of Abraham
• Salvian, Christian writer (approximate date)
• Sozomen, Christian Church historian

Deaths

• Castor of Karden, Christian priest and hermit
• Duan, Chinese empress and wife of Murong Bao
• Gainas, Gothic chieftain and general (magister militum)
• Li Lingrong, empress and mother of Jin Xiaowudi
• Lü Guang, emperor of the Di state Later Liang (b. 337)
• Lü Shao, "Heavenly Prince" (Tian Wang) of Later Liang
• Oribasius, Greek medical writer and physician