660s

Byzantine Empire

• Emperor Constans II is paranoid about the ambitions of his younger brother, Theodosius, and has him murdered. Having attracted the hatred of the citizens of Constantinople, Constans decides to leave the Byzantine capital and moves to Syracuse (Sicily).

Europe

• The March of the Slavs, centred north of modern Klagenfurt, preserves independence and is first mentioned in historical sources, known as Carantania (Austria).
• Felix, patrician^[1] of Toulouse, assumes the titles of Duke of Vasconia and Aquitaine. He is formally a vassal of the Franks, but rules "de facto" independently.

Britain

• King Cenwalh of Wessex becomes dissatisfied with his local bishop, Agilbert of Dorchester, as he does not speak West-Saxon. Cenwalh splits the episcopal see of Wessex in two. Wine becomes the first bishop of Winchester, by the Saxons called Wintancestir.^[2] Agilbert resigns in protest and travels north to Northumbria.
• King Sigeberht II of Essex is murdered by his brothers, Swithelm and Swithfrith, and other kinsmen for being "too ready to pardon his enemies"; that is to say, the Christians. Swithelm becomes king of Essex, with Swithfrith as joint-monarch for a period (approximate date).
• King Conall Crandomna of Dál Riata (modern Scotland) dies, and is succeeded by his nephew Domangart mac Domnaill.

Korea

• July 9 – Battle of Hwangsanbeol: Sillan forces (50,000 men) led by general Kim Yu-shin defeat the army of Baekje at Nonsan. During the fighting general Gyebaek dies at the hand of the Sillan invaders.
• Baekje in southwestern Korea is conquered by an alliance of the Tang Dynasty and Silla, led by general Su Dingfang and King Munmu of Silla. The Japanese envoys detained in Chang'an are paroled.
• Emperor Gao Zong suffers from an illness (possibly slow-poisoning). His wife Wu Zetian starts to rule the Chinese Empire.

Japan

• Prince Naka no Ōe no Ōji of Japan makes for the first time a clepsydra at Asuka, by which he causes the people to know the hours.

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