401 (CDI) was a common year starting on Tuesday of the Julian calendar, the 401st year of the Common Era (CE) and Anno Domini (AD) designations, the 401st year of the 1st millennium, the 1st year of the 5th century, and the 2nd year of the 400s decade. As of the start of 401, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium: 1st millennium
Centuries: 4th century5th century6th century
Decades: 370s  380s  390s  – 400s –  410s  420s  430s
Years: 398 399 400401402 403 404
401 in other calendars
Gregorian calendar401
CDI
Ab urbe condita1154
Assyrian calendar5151
Balinese saka calendar322–323
Bengali calendar−192
Berber calendar1351
Buddhist calendar945
Burmese calendar−237
Byzantine calendar5909–5910
Chinese calendar庚子(Metal Rat)
3097 or 3037
    — to —
辛丑年 (Metal Ox)
3098 or 3038
Coptic calendar117–118
Discordian calendar1567
Ethiopian calendar393–394
Hebrew calendar4161–4162
Hindu calendars
 - Vikram Samvat457–458
 - Shaka Samvat322–323
 - Kali Yuga3501–3502
Holocene calendar10401
Iranian calendar221 BP – 220 BP
Islamic calendar228 BH – 227 BH
Javanese calendar284–285
Julian calendar401
CDI
Korean calendar2734
Minguo calendar1511 before ROC
民前1511年
Nanakshahi calendar−1067
Seleucid era712/713 AG
Thai solar calendar943–944
Tibetan calendar阳金鼠年
(male Iron-Rat)
527 or 146 or −626
    — to —
阴金牛年
(female Iron-Ox)
528 or 147 or −625

Events

change


Deaths

for more information, see Category:401 deaths.