521


Millennium: 1st millennium
Centuries:
Decades:
Years:
521 in various calendars
Gregorian calendar521
DXXI
Ab urbe condita1274
Assyrian calendar5271
Balinese saka calendar442–443
Bengali calendar−72
Berber calendar1471
Buddhist calendar1065
Burmese calendar−117
Byzantine calendar6029–6030
Chinese calendar庚子年 (Metal Rat)
3218 or 3011
    — to —
辛丑年 (Metal Ox)
3219 or 3012
Coptic calendar237–238
Discordian calendar1687
Ethiopian calendar513–514
Hebrew calendar4281–4282
Hindu calendars
 - Vikram Samvat577–578
 - Shaka Samvat442–443
 - Kali Yuga3621–3622
Holocene calendar10521
Iranian calendar101 BP – 100 BP
Islamic calendar104 BH – 103 BH
Javanese calendar408–409
Julian calendar521
DXXI
Korean calendar2854
Minguo calendar1391 before ROC
民前1391年
Nanakshahi calendar−947
Seleucid era832/833 AG
Thai solar calendar1063–1064
Tibetan calendar阳金鼠年
(male Iron-Rat)
647 or 266 or −506
    — to —
阴金牛年
(female Iron-Ox)
648 or 267 or −505

Year 521 (DXXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Sabbatius and Valerius (or, less frequently, year 1274 Ab urbe condita). The denomination 521 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.