721

721 in various calendars
Gregorian calendar	721; DCCXXI
Ab urbe condita	1474
Armenian calendar	170; ԹՎ ՃՀ
Assyrian calendar	5471
Balinese saka calendar	642–643
Bengali calendar	128
Berber calendar	1671
Buddhist calendar	1265
Burmese calendar	83
Byzantine calendar	6229–6230
Chinese calendar	庚申年 (Metal Monkey); 3418 or 3211; — to —; 辛酉年 (Metal Rooster); 3419 or 3212
Coptic calendar	437–438
Discordian calendar	1887
Ethiopian calendar	713–714
Hebrew calendar	4481–4482
Hindu calendars
- Vikram Samvat	777–778
- Shaka Samvat	642–643
- Kali Yuga	3821–3822
Holocene calendar	10721
Iranian calendar	99–100
Islamic calendar	102–103
Japanese calendar	Yōrō 5; (養老５年)
Javanese calendar	614–615
Julian calendar	721; DCCXXI
Korean calendar	3054
Minguo calendar	1191 before ROC; 民前1191年
Nanakshahi calendar	−747
Seleucid era	1032/1033 AG
Thai solar calendar	1263–1264
Tibetan calendar	阳金猴年; (male Iron-Monkey); 847 or 466 or −306; — to —; 阴金鸡年; (female Iron-Rooster); 848 or 467 or −305

Millennium:	1st millennium
Centuries:	7th century; 8th century ; 9th century;
Decades:	700s; 710s; 720s ; 730s; 740s;
Years:	718; 719; 720; 721 ; 722; 723; 724;

Year 721 (DCCXXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 721 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.

Events

Theuderic IV succeeds Chilperic II as king of the Franks.
June 9 – Battle of Toulouse: after besieging Toulouse for three months, Al-Samh ibn Malik al-Khawlani, the governor of Muslim Spain (al-Andalus), is defeated by Duke Odo of Aquitaine, preventing an Arab invasion of Gaul.
Anbasa ibn Suhaim Al Kalbi is appointed governor of Al-Andalus.
Prague is founded (according to legend) by the Princess Libuše and her husband Přemysl, founder of the dynasty with the same name.

Rains and heavy storms around the southern seaport of Yangzhou reportedly destroy over 1,000 ships and boats, in the usual congested canal and river traffic of the Tang Dynasty era.