24 events the sources record for this year, grouped by region.
What happened
China (18)
In the first month, on the day yihai, the eight-year-old infant ruler Gao Heng ascended the throne and changed the era to Chengguang; the Later Ruler became Taishang Huang. Yan Zhitui and others urged raising troops beyond the river and seeking refuge in Chen. (Book of Northern Qi (Bei Qishu), Annals 北齊書 卷8)
In the first month, on the day jichou, Zhou troops reached Zimo Bridge; on the day guisi the west city gate burned, and the Taishang Huang fled east with about a hundred riders. The fall of Ye was imminent. (Book of Northern Qi (Bei Qishu), Annals 北齊書 卷8)
In the first month, the Taishang Huang reached Qingzhou intending to go to Chen, but at Dengcun south of Qingzhou he was captured by the Zhou general Yuchi Gang and escorted back to Ye. The Northern Qi perished (577). (Book of Northern Qi (Bei Qishu), Annals 北齊書 卷8)
The Zhou emperor Wu treated the Later Ruler as an honored guest and sent him to Chang'an with the empress dowager, the infant ruler and the princes, enfeoffing him as Duke of Wen. (In the seventh year of Jiande, 578, he was ordered to die on a false charge of rebellion.) (Book of Northern Qi (Bei Qishu), Annals 北齊書 卷8)
The Taishang Huang (the Later Ruler) was captured by the Zhou general Wei Xiangang at Dengcun, south of Qingzhou, and escorted to Ye, ending Northern Qi. (History of the Northern Dynasties (Beishi), Annals 北史 卷8 承光元年)
Grand Minister Wu Mingche routed tens of thousands of Northern Zhou troops under Liang Shiyan at Lüliang. (Book of Chen (Chenshu), Annals 陳書 卷5 太建9年 十月)
Cuthwine and Ceawlin, at Deorham, killed three British kings and took three cities: Gloucester, Cirencester, and Bath. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 577 항 (pg657.txt 줄 1256))
Chilperic summons Bishop Praetextatus of Rouen, confiscates Brunhild's property, and sends him into exile. (Gregory of Tours, History of the Franks Hist. Franc. 5.XIX)