AD 420

Millennium: 1st millennium
Centuries:
Decades:
Years:
420 in various calendars
Gregorian calendar420
CDXX
Ab urbe condita1173
Assyrian calendar5170
Balinese saka calendar341–342
Bengali calendar−173
Berber calendar1370
Buddhist calendar964
Burmese calendar−218
Byzantine calendar5928–5929
Chinese calendar己未年 (Earth Goat)
3117 or 2910
    — to —
庚申年 (Metal Monkey)
3118 or 2911
Coptic calendar136–137
Discordian calendar1586
Ethiopian calendar412–413
Hebrew calendar4180–4181
Hindu calendars
 - Vikram Samvat476–477
 - Shaka Samvat341–342
 - Kali Yuga3520–3521
Holocene calendar10420
Iranian calendar202 BP – 201 BP
Islamic calendar208 BH – 207 BH
Javanese calendar304–305
Julian calendar420
CDXX
Korean calendar2753
Minguo calendar1492 before ROC
民前1492年
Nanakshahi calendar−1048
Seleucid era731/732 AG
Thai solar calendar962–963
Tibetan calendar阴土羊年
(female Earth-Goat)
546 or 165 or −607
    — to —
阳金猴年
(male Iron-Monkey)
547 or 166 or −606
Pharamond is lifted on the shield by the Franks, by Pierre Révoil, 1841, and Michel Philibert Genod, 1845

Year 420 (CDXX) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Constantius (or, less frequently, year 1173 Ab urbe condita). The denomination 420 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.