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860 in various calendars
Gregorian calendar	860; DCCCLX
Ab urbe condita	1613
Armenian calendar	309; ԹՎ ՅԹ
Assyrian calendar	5610
Balinese saka calendar	781–782
Bengali calendar	267
Berber calendar	1810
Buddhist calendar	1404
Burmese calendar	222
Byzantine calendar	6368–6369
Chinese calendar	己卯年 (Earth Rabbit); 3557 or 3350; — to —; 庚辰年 (Metal Dragon); 3558 or 3351
Coptic calendar	576–577
Discordian calendar	2026
Ethiopian calendar	852–853
Hebrew calendar	4620–4621
Hindu calendars
- Vikram Samvat	916–917
- Shaka Samvat	781–782
- Kali Yuga	3960–3961
Holocene calendar	10860
Iranian calendar	238–239
Islamic calendar	245–246
Japanese calendar	Jōgan 2; (貞観２年)
Javanese calendar	757–758
Julian calendar	860; DCCCLX
Korean calendar	3193
Minguo calendar	1052 before ROC; 民前1052年
Nanakshahi calendar	−608
Seleucid era	1171/1172 AG
Thai solar calendar	1402–1403
Tibetan calendar	阴土兔年; (female Earth-Rabbit); 986 or 605 or −167; — to —; 阳金龙年; (male Iron-Dragon); 987 or 606 or −166

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	840s; 850s; 860s ; 870s; 880s;
Years:	857; 858; 859; 860 ; 861; 862; 863;

Year 860 (DCCCLX) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar.

Events

June 18 – Byzantine–Rus' War: A fleet of about 200 Rus' vessels sails into the Bosphorus, and starts pillaging the suburbs of Constantinople. The raiders set homes on fire, and drown and kill the citizens. Unable to do anything to repel the invaders, Patriarch Photios I urges his flock to implore the Theotokos to save the Byzantine capital.^[1] Having devastated the suburbs, the Rus' Vikings pass into the Sea of Marmara and attack the Isles of the Princes, plundering the local monasteries.^[2]

King Charles the Bald gives the order to build fortified bridges across the Seine and Loire Rivers, to protect Paris and the Frankish heartland against Viking raids. He hires the services of Weland, a Viking chieftain based on the Somme, to attack the Seine Vikings at their base on the Isle of Oissel. Weland besieges the Vikings—they offer him a huge bribe (6,000 pounds of silver) to let them escape.^[3]
Summer – The Viking chieftains Hastein and Björn Ironside ravage upstream and move to Italy, sacking Luna (believing it to be Rome). They sail up the River Arno to sack the cities of Pisa and Fiesole (Tuscany).^[4]
Summer – Viking raiders led by Weland sail to England and attack Winchester (the capital of Wessex), which is set ablaze. He spreads inland, but is defeated by West Saxon forces, who deprive him of all he has gained.^[5]
December 20 – King Æthelbald of Wessex dies after a 2½-year reign.^[6] He is succeeded by his brother, sub-king Æthelberht of Kent, who becomes sole ruler of Wessex.^[7]

Muhammad I, Umayyad emir of Córdoba, invades Pamplona (Pyrenees), and captures Crown Prince Fortún Garcés in Milagro, along with his daughter Onneca Fortúnez, and takes them as hostages to Córdoba.^[8]

Lusterware tiles, that decorated the mihrab of the Mosque of Uqba at Kairouan (modern Tunisia), are made (approximate date).

The Japanese alphabet Hiragana becomes more popular in Japan. The phonetic alphabet will be further simplified, and reduced to 51 basic characters (approximate date).

^ Logan, Donald F. (1992). The Vikings in history (2nd ed.). Routledge. p. 190. ISBN 0-415-08396-6.
^ Vasiliev, Alexander (1925). The Russian Attack on Constantinople in 860. Cambridge, MA: Mediaeval Academy of America. pp. 188–189.
^ John Haywood (1995). The Historical Atlas of the Vikings, pp. 60–61. Penguin Books: ISBN 978-0-140-51328-8.
^ John Haywood (1995). The Historical Atlas of the Vikings, p. 59. Penguin Books: ISBN 978-0-140-51328-8.
^ Paul Hill (2009). The Viking Wars of Alfred the Great, p. 20. ISBN 978-1-59416-087-5.
^ ^a ^b "Aethelbald - king of Wessex". Encyclopedia Britannica. Retrieved February 21, 2018.
^ "Aethelberht - king of Wessex". Encyclopedia Britannica. Retrieved February 21, 2018.
^ Martínez Diez, Gonzalo (2007). Sancho III el Mayor Rey de Pamplona, Rex Ibericus (in Spanish). Madrid: Marcial Pons Historia. p. 25. ISBN 978-84-96467-47-7. JSTOR j.ctt6wpw4q.