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Wikipedia / 641

Year 641 (DCXLI) was a common year starting on Monday of the Julian calendar. The denomination 641 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.

February 11 Emperor Heraclius, age 65, dies of dropsy at Constantinople after a 31-year reign. He reorganized the imperial administration, but lost Armenia, parts of Egypt, Palestine, Syria and Byzantine Mesopotamia to the Muslim Arabs. Heraclius is succeeded by his sons Constantine III and Heraklonas.
The Muslim conquest of Egypt continues, with the siege of Alexandria.
May Constantine III, age 29, dies of tuberculosis after a four-month reign, leaving his half-brother Heraklonas sole emperor. Rumors spread that Constantine has been poisoned by Heraclius's second wife (and niece) Martina.
September The Byzantine Senate turns against Martina and her son Heraklonas, who are both mutilated, and exiled to Rhodes. Supported by general Valentinus, Constantine's son Constans II, age 10, succeeds to the throne.
Constans II establishes a new civil-military defensive organisation, based upon geographical military districts. Byzantine forces maintain the frontier, along the line of the Taurus Mountains (Southern Turkey).

Aega, Mayor of the Palace and regent (alongside of queen mother Nanthild) of Neustria and Burgundy, dies during the reign of King Clovis II. He is replaced by Erchinoald, a relative of Dagobert I's mother.
The Lombards under King Rothari conquer Genoa (Liguria), and all remaining Byzantine territories in the lower Po Valley, including Oderzo (Opitergium).
Arechis I, duke of Benevento (northeast of Naples), dies after a 50-year reign and is succeeded by his son Aiulf I.

Prince Oswiu of Bernicia conquers Gododdin (or "The Old North") as far north as Manau (modern Scotland), on behalf of his half-brother, King Oswald (approximate date).
King Bridei II dies after a 5-year reign, and is succeeded by his brother Talorc III as ruler of the Picts.

November 8 Siege of Alexandria: Muslim Arabs under 'Amr ibn al-'As capture Alexandria after a six-month siege. Byzantine officials formally capitulate to Amr, turning the city over to Arab hands.
The city of Fustat (later Cairo) is founded in Egypt. It becomes the first capital of Egypt under Muslim rule.

Emperor Taizong of the Tang dynasty (China) instigates a civil war in the Western Turkic Khaganate, by supporting Isbara Yabghu Qaghan.
November 17 Emperor Jomei of Japan, age 48, dies after a 12-year reign.
Uija becomes the last king of the Korean kingdom of Baekje.

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