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This article is about the year 877. For the number, see 877 (number). For the area code, see Toll-free telephone number.
|Centuries:||8th century – 9th century – 10th century|
|Decades:||840s 850s 860s – 870s – 880s 890s 900s|
|Years:||874 875 876 – 877 – 878 879 880|
|877 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1630|
|Chinese calendar||丙申年 (Fire Monkey)
3573 or 3513
— to —
丁酉年 (Fire Rooster)
3574 or 3514
|- Vikram Samvat||933–934|
|- Shaka Samvat||799–800|
|- Kali Yuga||3978–3979|
|Japanese calendar||Jōgan 19 / Gangyō 1
|Minguo calendar||1035 before ROC
|Seleucid era||1188/1189 AG|
|Thai solar calendar||1419–1420|
- Indravarman I succeeds Jayavarman III as ruler of the Khmer Empire.
- What is now Syria became part of Egypt
- June – Charles sets out for Italy, accompanied by his wife Richilda and only a small number of his chief vassals. Orders are issued for an army to be assembled to join him a little later. Pope John VIII receives Charles at Vercelli. But at the same time Carloman, king of Bavaria and the East Mark, has also crossed the Alps into eastern Lombardy at the head of a powerful army. Charles hurries on the coronation of Richilda as Empress and sends her back to Gaul with orders for the reinforcements to hurry. However, the Frankish aristocracy is more concerned with the attacks by the Northmen in their country than the war with the Saracens in southern Italy. When the reinforcements do not arrive, Charles the Bald is compelled to return to West Francia. But on the road he dies in a poor hovel. It is said that he was poisoned by his Jewish doctor Zedekiah. Carloman of Bavaria, forced by an epidemic which broke out in his army, returns to Germany. When Louis the Stammerer receives news of the death of his father, Charles the Bald, he makes plans to go into West Francia to receive the oath of fidelity from his new subjects. On his way he learns that the magnates are refusing him obedience by rallying around Boso and the Abbot Hugh. The rebels are supported by his stepmother, the widowed Empress Richilda, and, as a sign of their displeasure, ravage the country. Boso is the brother of Richilda and duke of Provence. Hugh had been given the Abbey of Saint-Bertin by Louis’ father. Hincmar, Archbishop of Rheims, intercedes and the rebels agree to a settlement. The magnates, whose rights the king promises to recognize, all make their submissions.
- December 8 – Archbishop Hincmar crowns Louis the Stammerer as King of West Francia in the church of Compiègne.
- The Danes take Exeter, and settle in the Five Boroughs of England.
- A flotilla of 120 Danish ships is lost in a storm off Swanage.
- Battle of Strangford Lough: In a battle between Dubgaill and Finngaill Vikings at Strangford Lough in Ireland, Halfdan Ragnarsson, leader of the Great Heathen Army, is killed in an attempt to claim the Kingdom of Dublin from Bárid mac Ímair (who is lamed).
- Áed mac Cináeda succeeds his brother Causantín mac Cináeda as King of the Picts in Scotland.
- Pope John VIII requests the help of Charles the Bald, King of West Francia, against attacks by the Saracens in Italy.
- October 6 – Charles the Bald, King of the Western Franks and Western Emperor
- October 23 – Patriarch Ignatius of Constantinople
- Constantine I, King of the Scots and Picts
- Halfdan Ragnarsson