|Centuries:||7th century – 8th century – 9th century|
|Decades:||700s 710s 720s – 730s – 740s 750s 760s|
|Years:||728 729 730 – 731 – 732 733 734|
|731 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1484|
|Bahá'í calendar||−1113 – −1112|
|English Regnal year||N/A|
|Chinese calendar||庚午年 (Metal Horse)
3427 or 3367
— to —
辛未年 (Metal Goat)
3428 or 3368
|- Vikram Samvat||787–788|
|- Shaka Samvat||653–654|
|- Kali Yuga||3832–3833|
|Igbo calendar||−269 – −268|
|Japanese calendar||Tenpyō 3
|Minguo calendar||1181 before ROC
|Thai solar calendar||1274|
|Wikimedia Commons has media related to 731.|
Year 731 (DCCXXXI) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 731 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.
- Umayyad conquest of Gaul: Munuza, Moorish governor of Cerdagne (eastern Pyrenees), rebels against Umayyad authority. He is defeated and executed by Muslim forces under Abdul Rahman Al Ghafiqi at Urgell (Catalonia). Muslim garrisons in Septimania raid the cities Millau and Arles.
- Ragenfrid, ex-mayor of the palace of Neustria, meets duke Eudes of Aquitaine to accepts his rule and independence from the Frankish Kingdom. Fearing an alliance against him; Charles Martel exiles Ragenfrid's supporter Wandon of Fontenelle, and imprisons bishop Aimar of Auxerre.
- Charles Martel leads two raids across the Loire River into the Berry region. The Franks seizing and plundering Bourges (central France), but the city is immediately recaptured by Eudes of Aquitaine.
- Autumn – King Ceolwulf of Northumbria is deposed by opponents and forced to enter a monastery. His supporters subsequently restore him to the throne (or 732).
- King Æthelbald of Mercia overruns a large portion of Somerset and wrests the county from Wessex control (approximate date).
- Battle of the Defile: An Umayyad relief army (28,000 men) is sent to Samarkand (modern Uzbekistan) which is besieged by the Turgesh. The Muslims are ambushed near the Zarafshan Range at the Tashtakaracha Pass. The battle results in a Pyrrhic victory with heavy casualties for the Umayyad army, halting Muslim expansion in Central Asia for almost two decades.
- Bede, Anglo-Saxon monk and historian, completes his Historia ecclesiastica gentis Anglorum at the monastery of Saint Peter at Monkwearmouth.
- February 11 – Pope Gregory II dies at Rome after a 16-year reign in which he has fought Iconoclasm. He is succeeded by the Syrian-born cleric Gregory III as the 90th pope of the Catholic Church.
- An Moorish raiding party under Abdul Rahman Al Ghafiqi invade deep into Burgundy, and plunders the monastery of Luxeuil Abbey located in the Haute-Saône, massacring most of the community.
- November 1 – Synod of Rome: Gregory III summons a council at the shrine of Saint Peter. All western bishops participate, including the Roman nobility. Gregory condemns Iconoclasm as a heresy.
- Barjik, prince of the Khazar Khaganate
- Berhtwald, archbishop of Canterbury
- March 13 – Gerald of Mayo, Anglo-Saxon abbot
- February 11 – Gregory II, pope of the Catholic Church (b. 669)
- Munuza, Moorish governor of Cerdagne
- August 31 – Ōtomo no Tabito, Japanese poet (b. 665)
- Ragenfrid, mayor of the palace of Neustria
- Yuwen Rong, chancellor of the Tang Dynasty (or 730)
- David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 41). ISBN 978-184603-230-1
- David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 19). ISBN 978-184603-230-1
- Blankinship (1994), pp. 156, 157
- Kennedy (2001), p. 29
- Kennedy (2007), p. 285
- "Pope St. Gregory III". Catholic Encyclopedia. New York: Robert Appleton Company. 1913.
- Treadgold, p. 354