645 CE
First conflict of the Goguryeo–Tang War: A Chinese expeditionary army under Emperor Taizong of Tang crosses the Liao River into Goguryeo (one of the Three kingdoms of Korea). Isshi Incident: Prince Naka-no-Ōe and Fujiwara no Kamatari assassinate Soga no Iruka, during a coup d'état at the imperial palace. Tang forces under Li Shiji heading southeast toward the Yalu River put the strategic fortress of Ansi City (in the province of Liaoning) under siege.
Geopolitics & Diplomacy
- October 13 – Emperor Taizong is compelled to order a withdrawal from Goguryeo.source
- Empress Kōgyoku is forced to abdicate the throne in favor of her younger brother Kōtoku, age 49, who becomes the 36th emperor of Japan.source
- Kōtoku creates a new city at Naniwa, and moves the capital from Yamato Province. The capital has a sea port, establishing foreign trade and diplomatic relations.source
- King Cenwalh of Wessex is driven from his kingdom by his brother-in-law, King Penda of Mercia (according to Bede). He flees to the court of king Anna of East Anglia, and is baptised while in exile. Penda overruns Wessex.source
- Naka-no-Ōe becomes crown prince and prime minister. Supporters of the semi-legendary regent Prince Shōtoku gain supremacy in Japan.source
- Emperor Kōtoku establishes the Taika Reform: a land reform based on Confucian ideas and philosophies from China (approximate date)source
Conflict & Security
- May 1 – First conflict of the Goguryeo–Tang War: A Chinese expeditionary army under Emperor Taizong of Tang crosses the Liao River into Goguryeo (one of the Three kingdoms of Korea).source
- July 10 – Isshi Incident: Prince Naka-no-Ōe and Fujiwara no Kamatari assassinate Soga no Iruka, during a coup d'état at the imperial palace.source
- July 18 – Tang forces under Li Shiji heading southeast toward the Yalu River put the strategic fortress of Ansi City (in the province of Liaoning) under siege.source
- September – Taizong is unable to capture the Ansi fortress defended by Korean general Yang Manch'un. Food supplies running low, he withdraws his forces, ending the Siege of Ansi.source
- Alexandria revolts against Arab rule, at the appearance of a Byzantine fleet of 300 ships, and Byzantine forces recapture the city. Abdullah ibn Sa'ad, Arab governor of Egypt, mounts an assault and retakes it. He begins building a Muslim fleet.source
- Plato, exarch (imperial governor) of Ravenna, invades the southern Po Valley. The Lombards under King Rothari defeat him on the banks of the Panaro River (near Modena); 8,000 imperial troops are killed.source
Religion & Belief
Science & Discovery
- The first nengō, derived from the Chinese system of eras (nianhao) begins with the Taika era. (Unclear significance. Needs more explanation as to why this belongs in the list of major events of the year)source
Climate & Environment
- Gwynedd and much of Wales is in the grasp of famine. Would-be king Cadwaladr Fendigaid flees to Brittany. Civil war continues in his kingdom (approximate date).source
Births
Deaths
- April 26 – Richarius, Frankish hermit and monksource
- July 10 – Soga no Iruka, statesman of Japansource
- October 21 – Zhenzhu Khan, khan of Xueyantuosource
- Li Chengqian, crown prince of the Tang dynastysource
- Al-Khansa, Arabic poet (b. 575)source
- Soga no Emishi, statesman of Japan (b. 587)source
- Cen Wenben, chancellor and editor of the Book of Zhou (b. 595)source
- Yan Shigu, Chinese author of the Tang dynasty (b. 581)source