721

• 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.David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 18). {{ISBN|978-184603-230-1}}
• 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.David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 41). {{ISBN|978-184603-230-1}}
• 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).

• Abul Abbas al-Saffah, Muslim caliph (approximate date)
• Fujiwara no Uona, Japanese minister (d. 783)
• Jābir ibn Hayyān, Muslim alchemist (approximate date)
• Tachibana no Naramaro, Japanese statesman (d. 757)

• February 13 – Chilperic II, king of the Franks
• May 7 – John of Beverley, bishop of York{{cite web |title=Saint John of Beverley {{!}} English bishop |url=https://www.britannica.com/biography/Saint-John-of-Beverley |website=Encyclopedia Britannica |access-date=7 May 2021 |language=en}}
• December 29 – Genmei, empress of Japan (b. 660)
• Al-Samh ibn Malik al-Khawlani, Muslim general (approximate date)
• Ardo, king of the Visigoths (or 720)
• Eadfrith, bishop of Lindisfarne
• Headda, bishop of Lichfield (approximate date)
• Liu Zhiji, Chinese historian (b. 661)
• Tervel, ruler (khagan) of the Bulgarian Empire
• Yao Chong, chancellor of the Tang dynasty (b. 650)

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