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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

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

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.^[1]
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.^[2]

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.^[3]

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

References

^ Kelly, Christopher (2010). The End of Empire. New York: W.W. Norton & Company. p. 76. ISBN 978-0-39333-849-2.
^ Kidder, Jonathan Edward (1977). Ancient Japan. Oxford: Elsevier-Phaidon. p. 146. ISBN 978-0-72900-047-5.
^ Maas, Philipp André (2004). Samādhipāda das erste Kapitel des Pātañjalayogaśāstra zum ersten Mal kritisch ediert [Samādhipāda critically edited the first chapter of the Pātañjalayogaśāstra for the first time] (in German). Aachen: Shaker. ISBN 3832249877.