521

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Millennium: 1st millennium
Centuries: 5th century6th century7th century
Decades: 490s  500s  510s  – 520s –  530s  540s  550s
Years: 518 519 520521522 523 524
521 by topic
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State leadersSovereign states
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521 in other calendars
Gregorian calendar 521
DXXI
Ab urbe condita 1274
Armenian calendar N/A
Assyrian calendar 5271
Bahá'í calendar -1323–-1322
Bengali calendar -72
Berber calendar 1471
English Regnal year N/A
Buddhist calendar 1065
Burmese calendar -117
Byzantine calendar 6029–6030
Chinese calendar 庚子年十二月初八日
(3157/3217-12-8)
— to —
辛丑年十一月十七日
(3158/3218-11-17)
Coptic calendar 237–238
Ethiopian calendar 513–514
Hebrew calendar 4281–4282
Hindu calendars
 - Vikram Samvat 577–578
 - Shaka Samvat 443–444
 - Kali Yuga 3622–3623
Holocene calendar 10521
Iranian calendar 101 BP – 100 BP
Islamic calendar 104 BH – 103 BH
Japanese calendar
Korean calendar 2854
Minguo calendar 1391 before ROC
民前1391年
Thai solar calendar 1064

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.

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[edit] Arabia

  • Ma`adikarib Ya`fur conducts a military campaign in Mesopotamia.

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[edit] Music

  • Boëthius introduces Greek musical letter notation to the West.

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