1721

1721 (MDCCXXI) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1721st year of the Common Era (CE) and Anno Domini (AD) designations, the 721st year of the 2nd millennium, the 21st year of the 18th century, and the 2nd year of the 1720s decade. As of the start of 1721, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium:	2nd millennium
Centuries:	17th century – 18th century – 19th century
Decades:	1690s  1700s  1710s  – 1720s –  1730s  1740s  1750s
Years:	1718 1719 1720 – 1721 – 1722 1723 1724

1721 in other calendars

Gregorian calendar	1721 MDCCXXI
Ab urbe condita	2474
Armenian calendar	1170 ԹՎ ՌՃՀ
Assyrian calendar	6471
Balinese saka calendar	1642–1643
Bengali calendar	1128
Berber calendar	2671
British Regnal year	7 Geo. 1 – 8 Geo. 1
Buddhist calendar	2265
Burmese calendar	1083
Byzantine calendar	7229–7230
Chinese calendar	庚子年 (Metal Rat) 4417 or 4357     — to — 辛丑年 (Metal Ox) 4418 or 4358
Coptic calendar	1437–1438
Discordian calendar	2887
Ethiopian calendar	1713–1714
Hebrew calendar	5481–5482
Hindu calendars
- Vikram Samvat	1777–1778
- Shaka Samvat	1642–1643
- Kali Yuga	4821–4822
Holocene calendar	11721
Igbo calendar	721–722
Iranian calendar	1099–1100
Islamic calendar	1133–1134
Japanese calendar	Kyōhō 6 (享保６年)
Javanese calendar	1645–1646
Julian calendar	Gregorian minus 11 days
Korean calendar	4054
Minguo calendar	191 before ROC 民前191年
Nanakshahi calendar	253
Thai solar calendar	2263–2264
Tibetan calendar	阳金鼠年 (male Iron-Rat) 1847 or 1466 or 694     — to — 阴金牛年 (female Iron-Ox) 1848 or 1467 or 695

Events

• Pope Innocent XIII becomes pope
• Johann Sebastian Bach composes the Brandenburg Concertos
• April 4 – Robert Walpole becomes the first Prime Minister of the United Kingdom
• September 10 – Treaty of Nystad is signed, bringing an end to the Great Northern War
• November 2 – Peter I is proclaimed Emperor of All the Russias

Births

• April 19 - Roger Sherman, signer of the American Declaration of Independence (d. 1803)

Deaths

• July 18 - Antoine Watteau, French painter (b. 1684)
• September 2 - Kwon Sang-ha, Korean writer
• September 17 - Marguerite Louise d'Orléans, Grand Duchess of Tuscany
• December 13 - Alexander Selkirk, Scottish sailor (original "Robinson Crusoe") (b. 1676)