en 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 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

February 13 – King Chilperic II dies at Attigny (Ardennes), after a five-year reign. He is succeeded by Theuderic IV, infant son of Dagobert III, as Merovingian ruler of the Franks, under the control of the mayor of the palace, Charles Martel.
Summer – Charles Martel restores the authority of the Austrasian palace throughout the Frankish Kingdom, including against Frankish-claimed Aquitaine and Provence (Southern France). He exiles Rigobert, bishop of Reims, to Gascony.^[1]
June 9 – Battle of Toulouse: After besieging Toulouse for three months, Muslim forces under governor (wali) Al-Samh ibn Malik al-Khawlani are defeated by Eudes, duke of Aquitaine, preventing the extension of Umayyad control over Gaul.
Anbasa ibn Suhaym Al-Kalbi is appointed governor of Al-Andalus, after the death of Al-Samh. The Muslims under Abdul Rahman al-Ghafiqi withdraw to Narbonne. The Visigothic duke Amrus of the Lerida area recognises Umayyad rule.^[2]
Tervel, ruler (khagan) of the Bulgarian Empire, dies after a 21-year reign. He is succeeded by Kormesiy, possibly a son of Tervel, who is co-ruler and a descendant of the royal Dulo clan.
Prague is founded (according to legend) by Princess Libuše and her husband Přemysl, founder of the Přemyslid dynasty (approximate date).

King Ine of Wessex defeats Prince Cynewulf, an unknown relation making a push for the throne of Wessex.

May 31 – Wak Chanil Ajaw (Lady Six Sky), who had been the regent for her son Kʼakʼ Tiliw Chan Chaak from 693 until his attainment of majority, becomes the new queen of the Mayan city state of Naranjo in Guatemala when K'ak Tiliw dies from unknown causes. She reigns until her death in 741.

Rains and heavy storms around the southern seaport of Yangzhou destroy over 1,000 ships and boats in the Grand Canal, during the Tang dynasty (approximate date).

Prüm Abbey is founded by Bertrada, daughter of former king Theuderic III, and her son Charibert, count of Laon (approximate date).

^ David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 18). ISBN 978-184603-230-1
^ David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 41). ISBN 978-184603-230-1
^ "Saint John of Beverley | English bishop". Encyclopedia Britannica. Retrieved May 7, 2021.