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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 400 by topic |
|---|
| Leaders |
| Categories |
| 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 |
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.