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566 in various calendars
Gregorian calendar	566; DLXVI
Ab urbe condita	1319
Armenian calendar	15; ԹՎ ԺԵ
Assyrian calendar	5316
Balinese saka calendar	487–488
Bengali calendar	−27
Berber calendar	1516
Buddhist calendar	1110
Burmese calendar	−72
Byzantine calendar	6074–6075
Chinese calendar	乙酉年 (Wood Rooster); 3263 or 3056; — to —; 丙戌年 (Fire Dog); 3264 or 3057
Coptic calendar	282–283
Discordian calendar	1732
Ethiopian calendar	558–559
Hebrew calendar	4326–4327
Hindu calendars
- Vikram Samvat	622–623
- Shaka Samvat	487–488
- Kali Yuga	3666–3667
Holocene calendar	10566
Iranian calendar	56 BP – 55 BP
Islamic calendar	58 BH – 57 BH
Javanese calendar	454–455
Julian calendar	566; DLXVI
Korean calendar	2899
Minguo calendar	1346 before ROC; 民前1346年
Nanakshahi calendar	−902
Seleucid era	877/878 AG
Thai solar calendar	1108–1109
Tibetan calendar	阴木鸡年; (female Wood-Rooster); 692 or 311 or −461; — to —; 阳火狗年; (male Fire-Dog); 693 or 312 or −460

Millennium:	1st millennium
Centuries:	5th century; 6th century ; 7th century;
Decades:	540s; 550s; 560s ; 570s; 580s;
Years:	563; 564; 565; 566 ; 567; 568; 569;

566 (DLXVI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 566 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

A Byzantine army, under command of Baduarius, assists the Gepids in their war against the Lombards. The Byzantines win the first battle in the lower Danube (Moesia), but Gepid King Cunimund refuses to hand back the fortress city of Sirmium (modern Serbia), as he had promised.
Emperor Justin II, facing an empty treasury, breaks the treaty with the Gepids that has existed since 565. King Alboin of the Lombards makes an alliance with the Avars under Bayan I, at the expense of tough conditions. They demand a tenth of the Lombards' cattle and half of the war booty.
Justin II sends his cousin Justin to exile in Alexandria, where he is installed as Augustal prefect of Egypt. There he is murdered in his sleep, and his head is cut off and brought to Constantinople (most likely by assignment of Empress Sophia).^[1]

Ainmuire mac Sétnai becomes High King of Ireland, and rules from 566–569 (this according to the Book of Leinster).

A poet from Italy named Venantius Fortunatus arrives at the Merovingian court at Metz. With a strong grasp of traditional Roman poetry, Fortunatus impresses and entertains the Frankish royalty and aristocracy. The success of a Latin poet in Francia suggests that Roman culture persisted well after the Roman Empire disintegrated in Gaul in the late 5th century.^[2]

Fei Di, age 12, succeeds his father Wen Di, as emperor of the Chinese Chen dynasty. He honors his grand-aunt Zhang Yao'er with the title of Grand Empress, and she becomes his regent.
Kirtivarman I succeeds his father Pulakeshin I as king of the Chalukya dynasty (India). During his rule he completes the subjugation of the Kadambas and annexes the port of Goa.

^ Martindale, Jones & Morris (1992) p. 753–754
^ Wickham, Chris (2005). Framing the Early Middle Ages. p. 175.
^ Connor, Steve (July 7, 2014). "Our explosive past is written in the Antarctic ice". i. London. p. 17.