October 4 – Heraclian revolt: Heraclius arrives with a fleet from Africa at Constantinople. Assisted by an uprising in the capital, he overthrows and personally beheads Emperor Phocas. Heraclius gains the throne with help from his father Heraclius the Elder. His first major act is to change the official language of the Eastern Roman Empire from Latin to Greek (already the language of the vast majority of the population). Because of this, after AD 610, the Empire is customarily referred to as the Byzantine Empire (the term Byzantine is a modern term invented by historians in the 18th century; the people of the Empire itself always referred to themselves as "Ρωμαῖος" — tr. Rōmaios, Roman).
The Volga Bulgaria arises on the territory of modern Russia, being the first civilization in the region to arise from the Early Slavs (approximate date).
Muhammad, Islamic prophet, begins at 40 years old to preach a religion which will be called Islam. According to Islamic teachings, the angel Gabriel appears to him in a cave on Mount Hira near Mecca (Saudi Arabia) and calls him: "The Prophet of Allah". Muhammad gathers followers, reciting to them the first verses of Qur'an(Iqra), thus beginning the revelation of the Qur'an.[3]
Cynegils becomes king of the West Saxons, or Wessex, after the death of his uncle Ceolwulf (according to the Anglo-Saxon Chronicle). He rules from 611 to 643 and shares power to some extent with his eldest son, Cwichelm, who may have been given Upper Wessex (approximate date).
King Theudebert II is defeated by his brother Theuderic II at Toul (northeastern France). He is captured in battle and, after having his royal paraphernalia taken, is handed over to his grandmother Brunhilda. He is put in a monastery, and assassinated with his son Merovech. Theuderic, age 25, becomes sole ruler of Austrasia and Burgundy.
January 22 – Constantine is crowned co-emperor (Caesar) by his father Heraclius and shortly after betrothed to his cousin, Gregoria, daughter of Nicetas. Only 8 months old, Constantine has no real power and his dynastic title is purely ceremonial.
Chlothar II reunites the Frankish Kingdom by ordering the murder of Sigebert II. He accuses Brunhilda, age 70, of killing ten kings of the Franks (according to the Liber Historiae Francorum). She is dragged to death behind a wild horse at Abbeville.
Islam: Muhammad begins preaching in public. He spreads the message of Islam and encourages a personal devotion to God. Quraysh leaders of Mecca oppose any change in the traditional tribal and religious customs.
The city of Epidaurus (Dalmatia) is destroyed by the Avars and Slavic invaders. The Illyrian refugees flee to the nearby island Laus, where they found Dubrovnik (Ragusa). The islands of Rab, Krk and Cres become major food suppliers for the surviving cities of the mainland.[19]
May 25 – Pope Boniface IV dies after a 7-year reign, in which he has converted the Pantheon into the Church of "Santa Maria Rotonda". He is succeeded by Adeodatus I (also known as Deusdedit) as the 68th pope of Rome.
The Persian army under Shahin Vahmanzadegan destroys the city of Sardis, including its synagogue. Its importance is due to a highway, leading from the interior to the Aegean coast. Shahin marches through Anatolia, defeating the Byzantines numerous times.
Rædwald installs Edwin as king of Northumbria, effectively confirming him as bretwalda. He takes power in his native Deira and in Bernicia. His reign marks the domination of Northumbria as leading Anglo-Saxon state of the British Isles.
February 24 – Æthelberht, the first Christian Anglo-Saxon king, dies in Kent after a 26-year reign. He is succeeded by his pagan son, Eadbald, who promptly marries his stepmother Emma, in accordance with pre-Christian custom.
King Sæberht of Essex dies after a 12-year reign, and is succeeded by his son Sexred. He rules conjointly with his two brothers Sæward and Sigeberht; they throw out the Christian missionaries and return to paganism.
The Battle of Chester (Old Welsh: Guaith Caer Legion; Welsh: Brwydr Caer), which separates the (West) Welsh from the 'North' Welsh of Cumbria - marking the formation of Wales, is fought (approximate date).
Mellitus, bishop of London, is exiled by Sexred and his pagan brothers (Sæward and Sigeberht). He is forced to take refuge in Gaul, and returns to England the following year.
The Quraish clans begins to boycott Muhammad and Banu Hashem, in order to put pressure on his Muslim followers and his Islamic preachings.
A shrine on the site of the future Westminster Abbey (London) is founded (approximate date).
The Avars send envoys to Constantinople for a meeting with Heraclius. He is warned about an ambush, and flees for safety behind the city walls in time. Angry at the failure to capture the Byzantine emperor, the Avars plunder Thrace and return to the Danube River, carrying off 270,000 people.[27]
Winter – Li Yuan demotes Sui emperor Yángdi to the status of Taishang Huang (retired emperor), and declares Yang You emperor, while he gives himself authority over the western Sui commanderies (prefecture), under the title of "Prince of Tang".
The Persians besiege Alexandria; the defence of the city is led by Nicetas (cousin of emperor Heraclius). The Byzantine resistance is undermined by a blockade of the harbor; the usual grain supplies are cut off from Egypt to Constantinople.
The Avars attack the outskirts of Constantinople. Numerous Slavic tribes rebel against Avar overlordship; they carve out their own sovereign territory in Moravia and Lower Austria (approximate date).
^The Anglo-Saxon Chronicle (E) records this battle under the year 605, but this is considered incorrect; see Michael Swanton's translation of the ASC (1996, 1998, paperback), page 23, note 2. Between 613/616 is the generally accepted date, as first proposed by Charles Plummer, Venerabilis Beda Opera Historica (1896)
^Crawford, Peter (2013). The War of the Three Gods: Romans, Persians and the Rise of Islam. Pen and Sword. pp. 41–43. ISBN9781473828650.
^Alan Harding, "Medieval Law and the Foundations of the State", (Oxford University Press, 2001), p. 14
^S. Wise Bauer, "The History of the Medieval World: From the Conversion of Constantine to the First Crusade", W.W. Norton & Company, 2010), p. 251
^Golden 1992, p. 135. According to Chinese historical sources, the marriage was never carried out because of interference by the Eastern Göktürk Illig Qaghan, whose territory sat between his territory and Tang territory, and who felt threatened by the proposed marriage. Zizhi Tongjian, vol. 192.
^McErlean, Thomas; Crothers, Norman (2007). Harnessing the Tides: The Early Medieval Tide Mills at Nendrum Monastery, Strangford Lough. Norwich: The Stationery Office. ISBN978-0-337-08877-3.