668 CE
Emperor Constans II is killed under mysterious circumstances in his bath, during a mutiny at Syracuse. The Byzantine court returns to Constantinople after an absence of 5 years, in which the Muslim-Arabs have made annual invasions and devastations of Anatolia. Probably assassinated by his chamberlain after a 27-year reign, Constans is succeeded by his son Constantine IV (the "Bearded"), alongside his brothers Heraclius and Tiberius as co-emperors. Theodore of Tarsus is made archbishop of Canterbury. He introduces a strict Roman parochial system that becomes the model for the secular state. Emperor Tenji of Japan officially accedes to the throne, and hunts on the Moor of Ōmi-Gamōno. The letters exchanged between prince Ōama and princess Nukata are recorded in Man'yōshū.
Geopolitics & Diplomacy
- Ebroin, mayor of the palace, becomes de facto ruler of Neustria and (in theory) "of the Franks". According to Bede, he runs the nation's foreign policy and internal security.source
Conflict & Security
- July 15 – Emperor Constans II is killed under mysterious circumstances in his bath, during a mutiny at Syracuse. The Byzantine court returns to Constantinople after an absence of 5 years, in which the Muslim-Arabs have made annual invasions and devastations of Anatolia. Probably assassinated by his chamberlain after a 27-year reign, Constans is succeeded by his son Constantine IV (the "Bearded"), alongside his brothers Heraclius and Tiberius as co-emperors.source
- Kotrag, ruler (khagan) of Great Bulgaria, leads the Khazars in overthrowing his brother Batbayan of the Onogurs, and moves south into the Carpathian Mountains.source
- Arab forces conquer the Garamantes in the Sahara desert (Libya).source
- Emperor Tenji of Japan officially accedes to the throne, and hunts on the Moor of Ōmi-Gamōno. The letters exchanged between prince Ōama and princess Nukata are recorded in Man'yōshū.source
- Yazid reaches Chalcedon in Bithynia, and takes the important Byzantine center Amorium (modern Turkey).source
Exploration & Expansion
- Asparukh, leader of the Utigurs, leaves the Ongal area to Kotrag, and leads his people into Moesia in Northern Bulgaria (approximate date).source
- Chinese troops sent by the Tang dynasty emperor Gao Zong complete their expedition in the Korean Peninsula. Leaders of the expedition have been selected by the emperor's powerful concubine Wu Zetian. The kingdom of Goguryeo is overthrown; the Unified Silla period starts.source
- Mezezius, Byzantine general and patrikios ("first patrician"), is proclaimed emperor by the army in Syracuse. Constantine IV organizes an expedition to suppress the military revolt in Sicily.source
Religion & Belief
- Theodore of Tarsus is made archbishop of Canterbury. He introduces a strict Roman parochial system that becomes the model for the secular state.source
- Colman of Lindisfarne, accompanied by 30 disciples, sails for Ireland, settling down at Inishbofin and founds a monastery.source
- Caliph Muawiyah I receives an invitation from Saborios, Byzantine commander of the troops in Armenia, to help overthrow Constantine IV in Constantinople. He sends a Muslim army under his son Yazid, against the Byzantine Empire.source
- The monk Gyōki, one of the founders of Japanese Buddhism, is born in the Ōtori District of Kawachi Province.source
Births
Deaths
- September 15 – Constans II, Byzantine emperor (b. 630)source
- Saborios, Byzantine general (approximate date)source
- Judoc, Breton noble and Catholic saint (b. 600)source
- Wandregisel, Frankish monk and abbotsource
- Brahmagupta, Indian mathematician and astronomer (b. ca. 598)source
- Zhiyan, Chinese (Buddhist) patriarch (b. 602)source