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AD 630: March 21 – Emperor Heraclius returns the True Cross, one of the holiest Christian relics, to Jerusalem. He tries to promote Monothelitism, which is rejected by the Christians.

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AD 628: Brahmagupta writes the Brāmasphuțasiddhānta, an early, yet very advanced, math book.

AD 626: Winter – Heraclius makes an alliance with Tong Yabghu Qaghan, ruler (khagan) of the Western Turkic Khaganate, for a joint invasion of the Persian Empire the following spring. He promises his daughter Eudoxia Epiphania, age 15, in marriage to Tong Yabghu and sends her under escort with...

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AD 624: Byzantine–Sasanian War: Emperor Heraclius advances with an expeditionary force (40,000 men) along the Araxes River, destroying the fortress city of Dvin, capital of Armenia, and Nakhchivan (modern Azerbaijan). At Ganzak, Heraclius defeats the Persian army and destroys the famous fire...

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AD 622: The Western Turks conquer the Oxus valley and cooperate with Heraclius against Persia, taking Khorasan (modern Afghanistan).

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AD 620: The town of Cholula is founded in central Mexico (later said to be the oldest continuously occupied town in all of North America).

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