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777 in various calendars
Gregorian calendar	777; DCCLXXVII
Ab urbe condita	1530
Armenian calendar	226; ԹՎ ՄԻԶ
Assyrian calendar	5527
Balinese saka calendar	698–699
Bengali calendar	184
Berber calendar	1727
Buddhist calendar	1321
Burmese calendar	139
Byzantine calendar	6285–6286
Chinese calendar	丙辰年 (Fire Dragon); 3474 or 3267; — to —; 丁巳年 (Fire Snake); 3475 or 3268
Coptic calendar	493–494
Discordian calendar	1943
Ethiopian calendar	769–770
Hebrew calendar	4537–4538
Hindu calendars
- Vikram Samvat	833–834
- Shaka Samvat	698–699
- Kali Yuga	3877–3878
Holocene calendar	10777
Iranian calendar	155–156
Islamic calendar	160–161
Japanese calendar	Hōki 8; (宝亀８年)
Javanese calendar	672–673
Julian calendar	777; DCCLXXVII
Korean calendar	3110
Minguo calendar	1135 before ROC; 民前1135年
Nanakshahi calendar	−691
Seleucid era	1088/1089 AG
Thai solar calendar	1319–1320
Tibetan calendar	阳火龙年; (male Fire-Dragon); 903 or 522 or −250; — to —; 阴火蛇年; (female Fire-Snake); 904 or 523 or −249

Millennium:	1st millennium
Centuries:	7th century; 8th century ; 9th century;
Decades:	750s; 760s; 770s ; 780s; 790s;
Years:	774; 775; 776; 777 ; 778; 779; 780;

Year 777 (DCCLXXVII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar, the 777th year of the Common Era (CE) and Anno Domini (AD) designations, the 777th year of the 1st millennium, the 77th year of the 8th century, and the 8th year of the 770s decade. The denomination 777 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

Saxon Wars: King Charlemagne spends Easter in Nijmegen, and leads a large Frankish army to Paderborn, where a general assembly of Carolingian and Saxon leaders had been summoned. Saxon lands are integrated into the Frankish Kingdom, and divided into missionary parishes. Duke Widukind and his followers flee to King Sigfred of Denmark, seeking refuge and support.^[1]
Abbasid–Carolingian alliance: Charlemagne receives a request for support from pro-Abbasid rulers in the eastern thughur, or military frontier zone of the Emirate of Córdoba. Several powerful officials and noblemen in northeastern Iberia, such as the governors of Barcelona and Zaragoza, seek to rise up against the Umayyad emir Abd al-Rahman I.^[2]

Duke Tassilo III of Bavaria founds Kremsmünster Abbey (modern Austria). During this period, the Tassilo Chalice is possibly donated by Luitpirga, wife of Tassilo (approximate date).

date unknown
- Heungdeok, king of Silla (Korea) (d. 836)
- Ishaq ibn Rahwayh, Muslim imam (or 778)^[3]
- Masawaiyh, Assyrian physician (d. 857)

^ David Nicolle (2014). The Conquest of Saxony AD 782–785, p. 12. ISBN 978-1-78200-825-5.
^ David Nicolle (2014). The Conquest of Saxony AD 782–785, p. 16. ISBN 978-1-78200-825-5.
^ Ibn Rāhwayh, Isḥāq (1990), Balūshī, ʻAbd al-Ghafūr ʻAbd al-Ḥaqq Ḥusayn (ed.), Musnad Isḥāq ibn Rāhwayh (1st ed.), Tawzīʻ Maktabat al-Īmān, pp. 57–59
^ Plofker, Kim (2007). "Fazārī: Muḥammad ibn Ibrāhīm al‐Fazārī". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 362–3. ISBN 978-0-387-31022-0.
^ Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (Third revised ed.). Cambridge: Cambridge University Press. p. 223. ISBN 0-521-56350-X.