|Covid-19|Spring–summer – Arab forces under Hasan ibn al-Nu'man capture Carthage, ending Byzantine rule in North Africa. The defeated Byzantine fleet revolts and proclaims Tiberios III, who deposes Leontios after a brief siege of Constantinople, Byzantine Emperor.
Autumn–winter – The Byzantine general Heraclius, brother of Tiberios III, crosses with an army the mountain passes of the Taurus Mountains into Cilicia. He launches a campaign in Syria, defeats an Arab force from Antioch, and raids as far as Samosata (modern Turkey).
Wittiza, son of King Ergica, becomes co-ruler of the Visigoth Kingdom in Hispania (approximate date).
Berhtred, Anglo-Saxon nobleman, is killed leading a Northumbrian army against the Picts. The kingdom of Cait (or Cat) in northern Scotland is absorbed (approximate date).
Fiannamail ua Dúnchado becomes king of Dál Riata (Scotland), until his death around 700 (approximate date).
Berber forces led by Queen Kahina ("The Diviner") are crushed by Arab invaders at Aures (Algeria). She has rallied the Berbers since the collapse of Byzantine power (see 647).
Dae Jo-young establishes the kingdom of Balhae in Manchuria (approximate date).
Khun Lo, a Thai prince, conquers Muang Sua, an early Laotian kingdom.
Qapaghan Qaghan conquers parts of Transoxiana (Central Asia).
The festival of first-fruits (Daijo-sai) is held in Japan.
Council of Aquileia: The bishops of the diocese of Aquileia decide to end the Schism of the Three Chapters and return to communion with Rome.
Willibrord, Anglo-Saxon missionary, establishes an abbey at Echternach (Luxembourg), presented to him by Irmina, daughter of King Dagobert II.
Probable date of Cuthbert's burial behind the altar at Lindisfarne (approximate date).
Princess Taki is sent to Saikū, as a Saiō of the Ise Shrine (Japan).
Shang, emperor of the Tang Dynasty (or 695)
Wang Changling, Chinese poet and official (d. 756)
May 6 – Eadberht, bishop of Lindisfarne
July 22 – Wu Chengsi, nephew of Chinese sovereign Wu Zetian
Ainbcellach mac Ferchair, king of Dál Riata (Scotland)
Berthtred, Anglo-Saxon noblemen (approximate date)
Rieul, bishop of Reims (approximate date)
Suraqah al-Bariqi, Arab poet (b. 621)
Trudo, Frankish abbot (approximate date)
Year 698 (DCXCVIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 698 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.