|Covid-19|Emperor Leo III issues a series of edicts banning the veneration of images (726–729), and launching the iconoclastic controversies. Most of the clergy – particularly in Italy and Greece – are opposed to these edicts with uncompromising hostility, and in the western parts of the Byzantine Empire the people refuse to obey his religious reforms.
Arab–Byzantine War: Muslim forces under Maslama ibn Abd al-Malik resume their expedition against Anatolia (modern Turkey). In a large-scale raid they plunder the fortress city of Caesarea.
Umayyad conquest of Gaul: Muslim raiders under Abdul Rahman al-Ghafiqi, current governor of Septimania, devastate Avignon, Viviers, Valence, Vienne and Lyon (approximate date).
Marcello Tegalliano dies after a 9-year reign, and is succeeded by Orso Ipato as the third doge of Venice. He is recognised by Leo III, who gives him the title hypatos.
Seismic activity in the Mediterranean Sea: The volcanic island of Thera erupts, while the city of Jerash (in present-day Jordan) suffers a major earthquake.
King Ine of Wessex resigns his crown, and travels on a pilgrimage to Rome. He is succeeded by his brother-in-law (and probably distant cousin) Æthelheard.
Dúngal mac Selbaig is deposed as king of Dál Riata (Scotland). He is succeeded by Eochaid mac Echdach (a son of former king Eochaid mac Domangairt).
The first annual Sumo tournament in Japan is held by Emperor Shōmu (approximate date).
Abbo of Provence, Frankish nobleman, founds Novalesa Abbey in Piedmont (Northern Italy).
Grifo, Frankish duke and son of Charles Martel (d. 753)
Paulinus II, patriarch of Aquileia (approximate date)
Anbasa ibn Suhaym al-Kalbi, Muslim governor
Marcello Tegalliano, doge of Venice
Oda of Scotland, Christian saint (approximate date)
Smbat VI, Armenian prince
Tobias, bishop of Rochester
October 22 – Itzamnaaj K'awiil, a Maya ruler of Dos Pilas
Year 726 (DCCXXVI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 726 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.