400

400 (CD) was a leap year starting on Sunday in the Julian calendar.

Millennium:	1st millennium
Centuries:	3rd century – 4th century – 5th century
Decades:	370s  380s  390s  – 400s –  410s  420s  430s
Years:	397 398 399 – 400 – 401 402 403

400 in other 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) 3096 or 3036     — to — 庚子年 (Metal Rat) 3097 or 3037
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

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).

Events

• First invasion of Italy by Alaric (probable date).
• The Vandals start their westward trek from Dacia and Hungary (approximate date).
• Construction (and therefore occupation) at Great Zimbabwe begins (approximate date).
• Earliest date of human occupation on Easter Island (approximate date).
• Chrysanthemums are introduced to Japan (approximate date).